diff --git a/src/main/java/envoy/data/Contacts.java b/src/main/java/envoy/data/Contacts.java
index bd19102..c86c1fc 100644
--- a/src/main/java/envoy/data/Contacts.java
+++ b/src/main/java/envoy/data/Contacts.java
@@ -7,38 +7,27 @@ import java.util.List;
  * Project: <strong>envoy-common</strong><br>
  * File: <strong>Contacts.java</strong><br>
  * Created: <strong>02.01.2020</strong><br>
- * 
+ *
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
 public class Contacts implements Serializable {
 
-	private final long			userId;
-	private final List<User>	contacts;
+	private final List<User> contacts;
 
 	private static final long serialVersionUID = 136970804968152871L;
 
 	/**
 	 * Creates an instance of {@link Contacts}.
 	 *
-	 * @param userId   the ID of the user this contacts belong to
 	 * @param contacts the contact list
 	 * @since Envoy Common v0.2-alpha
 	 */
-	public Contacts(long userId, List<User> contacts) {
-		this.userId		= userId;
-		this.contacts	= contacts;
-	}
+	public Contacts(List<User> contacts) { this.contacts = contacts; }
 
 	@Override
 	public String toString() { return String.format("Contacts[%s]", contacts); }
 
-	/**
-	 * @return the ID of the user this contacts belong to
-	 * @since Envoy Common v0.2-alpha
-	 */
-	public long getUserId() { return userId; }
-
 	/**
 	 * @return a list of users messages can be sent to
 	 * @since Envoy Common v0.2-alpha
diff --git a/src/main/java/envoy/event/ContactOperationEvent.java b/src/main/java/envoy/event/ContactOperationEvent.java
new file mode 100644
index 0000000..7410e65
--- /dev/null
+++ b/src/main/java/envoy/event/ContactOperationEvent.java
@@ -0,0 +1,61 @@
+package envoy.event;
+
+import envoy.data.User;
+
+/**
+ * Signifies the modification of a contact list.<br>
+ * <br>
+ * Project: <strong>envoy-common</strong><br>
+ * File: <strong>ContactOperationEvent.java</strong><br>
+ * Created: <strong>05.02.2020</strong><br>
+ *
+ * @author Maximilian K&auml;fer
+ * @since Envoy Common v0.2-alpha
+ */
+public class ContactOperationEvent extends Event<User> {
+
+	/**
+	 * Specifies the operation performed on a contact list.<br>
+	 * <br>
+	 * Project: <strong>envoy-common</strong><br>
+	 * File: <strong>ContactOperationEvent.java</strong><br>
+	 * Created: <strong>05.02.2020</strong><br>
+	 *
+	 * @author Maximilian K&auml;fer
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public enum Operation {
+
+		/**
+		 * Adds a user to the contact list.
+		 */
+		ADD,
+
+		/**
+		 * Removes a user from the contact list.
+		 */
+		REMOVE;
+	}
+
+	private final Operation operationType;
+
+	private static final long serialVersionUID = -1166652868189511553L;
+
+	/**
+	 * Initializes a {@link ContactOperationEvent}.
+	 *
+	 * @param contact       the user on which the operation is performed
+	 * @param operationType the type of operation to perform
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public ContactOperationEvent(User contact, Operation operationType) {
+		super(contact);
+		this.operationType = operationType;
+	}
+
+	/**
+	 * @return the type of operation to perform
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public Operation getOperationType() { return operationType; }
+}
diff --git a/src/main/java/envoy/event/ContactSearchRequest.java b/src/main/java/envoy/event/ContactSearchRequest.java
new file mode 100644
index 0000000..4076265
--- /dev/null
+++ b/src/main/java/envoy/event/ContactSearchRequest.java
@@ -0,0 +1,24 @@
+package envoy.event;
+
+/**
+ * Requests a contact search from the server.<br>
+ * <br>
+ * Project: <strong>envoy-common</strong><br>
+ * File: <strong>ContactSearchRequest.java</strong><br>
+ * Created: <strong>05.02.2020</strong><br>
+ *
+ * @author Maximilian K&auml;fer
+ * @since Envoy Common v0.2-alpha
+ */
+public class ContactSearchRequest extends Event<String> {
+
+	private static final long serialVersionUID = -7969312055630533627L;
+
+	/**
+	 * Initializes a {@link ContactSearchRequest}.
+	 *
+	 * @param searchPhrase the search phrase to use in the contact search
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public ContactSearchRequest(String searchPhrase) { super(searchPhrase); }
+}
diff --git a/src/main/java/envoy/event/ContactSearchResult.java b/src/main/java/envoy/event/ContactSearchResult.java
new file mode 100644
index 0000000..929ee30
--- /dev/null
+++ b/src/main/java/envoy/event/ContactSearchResult.java
@@ -0,0 +1,28 @@
+package envoy.event;
+
+import java.util.List;
+
+import envoy.data.User;
+
+/**
+ * Contains a list of {@link User}s for which a search was performed.<br>
+ * <br>
+ * Project: <strong>envoy-common</strong><br>
+ * File: <strong>ContactSearchResult.java</strong><br>
+ * Created: <strong>11 Feb 2020</strong><br>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy Common v0.2-alpha
+ */
+public class ContactSearchResult extends Event<List<User>> {
+
+	private static final long serialVersionUID = -8934154116102031561L;
+
+	/**
+	 * Creates an instance of {@link ContactSearchResult}.
+	 *
+	 * @param users the users found during the search
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public ContactSearchResult(List<User> users) { super(users); }
+}
diff --git a/src/main/java/envoy/event/Event.java b/src/main/java/envoy/event/Event.java
index 3be9d9c..9d42bf5 100644
--- a/src/main/java/envoy/event/Event.java
+++ b/src/main/java/envoy/event/Event.java
@@ -11,10 +11,36 @@ import java.io.Serializable;
  * @param <T> the type of the Event
  * @since Envoy v0.2-alpha
  */
-public interface Event<T> extends Serializable {
+public abstract class Event<T> implements Serializable {
+
+	protected final T value;
+
+	private static final long serialVersionUID = 4673659457380399167L;
+
+	protected Event(T value) { this.value = value; }
 
 	/**
 	 * @return the data associated with this event
 	 */
-	default T get() { return null; }
+	public T get() { return value; }
+
+	@Override
+	public String toString() { return String.format("%s[value=%s]", this.getClass().getSimpleName(), value); }
+
+	/**
+	 * Serves as a super class for events that do not carry a value.<br>
+	 * <br>
+	 * Project: <strong>envoy-common</strong><br>
+	 * File: <strong>Event.java</strong><br>
+	 * Created: <strong>11 Feb 2020</strong><br>
+	 *
+	 * @author Kai S. K. Engelbart
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public static abstract class Valueless extends Event<Void> {
+
+		private static final long serialVersionUID = -9019362144094097997L;
+
+		protected Valueless() { super(null); }
+	}
 }
diff --git a/src/main/java/envoy/event/EventBus.java b/src/main/java/envoy/event/EventBus.java
index f2e5c9f..146fb58 100644
--- a/src/main/java/envoy/event/EventBus.java
+++ b/src/main/java/envoy/event/EventBus.java
@@ -1,18 +1,15 @@
 package envoy.event;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
+import java.util.function.Consumer;
 
 /**
- * This class handles events by allowing {@link EventHandler} object to register
- * themselves and then be notified about certain events dispatched by the event
- * bus.<br>
+ * This class handles events by allowing event handlers to register themselves
+ * and then be notified about certain events dispatched by the event bus.<br>
  * <br>
  * The event bus is a singleton and can be used across the entire application to
  * guarantee the propagation of events.<br>
- *
+ * <br>
  * Project: <strong>envoy-common</strong><br>
  * File: <strong>EventBus.java</strong><br>
  * Created: <strong>04.12.2019</strong><br>
@@ -23,14 +20,13 @@ import java.util.Map;
 public class EventBus {
 
 	/**
-	 * Contains all {@link EventHandler} instances registered at this
-	 * {@link EventBus} as values mapped to by their supported {@link Event}
-	 * classes.
+	 * Contains all event handler instances registered at this event bus as values
+	 * mapped to by their supported event classes.
 	 */
-	private Map<Class<? extends Event<?>>, List<EventHandler>> handlers = new HashMap<>();
+	private Map<Class<? extends Event<?>>, List<Consumer<Event<?>>>> handlers = new HashMap<>();
 
 	/**
-	 * The singleton instance of this {@link EventBus} that is used across the
+	 * The singleton instance of this event bus that is used across the
 	 * entire application.
 	 */
 	private static EventBus eventBus = new EventBus();
@@ -43,39 +39,40 @@ public class EventBus {
 	private EventBus() {}
 
 	/**
-	 * @return the singleton instance of the {@link EventBus}
+	 * @return the singleton instance of the event bus
 	 * @since Envoy v0.2-alpha
 	 */
 	public static EventBus getInstance() { return eventBus; }
 
 	/**
-	 * Registers an {@link EventHandler} to be notified when a
-	 * {@link Event} of a certain type is dispatched.
+	 * Registers an event handler to be notified when an
+	 * event of a certain type is dispatched.
 	 *
-	 * @param eventClass the class which the {@link EventHandler} is subscribed to
-	 * @param handler    the {@link EventHandler} to register
+	 * @param <T>        the type of event values to notify the handler about
+	 * @param eventClass the class which the event handler is subscribing to
+	 * @param handler    the event handler to register
 	 * @since Envoy v0.2-alpha
 	 */
-	public void register(Class<? extends Event<?>> eventClass, EventHandler handler) {
+	@SuppressWarnings("unchecked")
+	public <T extends Event<?>> void register(Class<T> eventClass, Consumer<T> handler) {
 		if (!handlers.containsKey(eventClass)) handlers.put(eventClass, new ArrayList<>());
-		handlers.get(eventClass).add(handler);
+		handlers.get(eventClass).add((Consumer<Event<?>>) handler);
 	}
 
 	/**
-	 * Dispatches a {@link Event} to every {@link EventHandler} subscribed to it.
+	 * Dispatches an event to every event handler subscribed to it.
 	 *
 	 * @param event the {@link Event} to dispatch
 	 * @since Envoy v0.2-alpha
 	 */
 	public void dispatch(Event<?> event) {
-		handlers.keySet().stream().filter(event.getClass()::isAssignableFrom).map(handlers::get).flatMap(List::stream).forEach(h -> h.handle(event));
+		handlers.keySet().stream().filter(event.getClass()::isAssignableFrom).map(handlers::get).flatMap(List::stream).forEach(h -> h.accept(event));
 	}
 
 	/**
-	 * @return a map of all {@link EventHandler} instances currently registered at
-	 *         this {@link EventBus} with the {@link Event} classes they are
-	 *         subscribed to as keys
+	 * @return a map of all event handler instances currently registered at this
+	 *         event bus with the event classes they are subscribed to as keys
 	 * @since Envoy v0.2-alpha
 	 */
-	public Map<Class<? extends Event<?>>, List<EventHandler>> getHandlers() { return handlers; }
+	public Map<Class<? extends Event<?>>, List<Consumer<Event<?>>>> getHandlers() { return handlers; }
 }
diff --git a/src/main/java/envoy/event/EventHandler.java b/src/main/java/envoy/event/EventHandler.java
deleted file mode 100644
index f842476..0000000
--- a/src/main/java/envoy/event/EventHandler.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package envoy.event;
-
-/**
- * Project: <strong>envoy-common</strong><br>
- * File: <strong>EventHandler.java</strong><br>
- * Created: <strong>04.12.2019</strong><br>
- *
- * @author Kai S. K. Engelbart
- */
-public interface EventHandler {
-
-	/**
-	 * Consumes an event dispatched by the event bus.
-	 *
-	 * @param event The event dispatched by the event bus, only of supported type
-	 */
-	void handle(Event<?> event);
-}
diff --git a/src/main/java/envoy/event/HandshakeRejectionEvent.java b/src/main/java/envoy/event/HandshakeRejectionEvent.java
index 66bbbc8..8304a11 100644
--- a/src/main/java/envoy/event/HandshakeRejectionEvent.java
+++ b/src/main/java/envoy/event/HandshakeRejectionEvent.java
@@ -13,7 +13,7 @@ import envoy.data.LoginCredentials;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.3-alpha
  */
-public class HandshakeRejectionEvent implements Event<String> {
+public class HandshakeRejectionEvent extends Event<String> {
 
 	/**
 	 * Select this value if a given password hash was incorrect
@@ -53,7 +53,7 @@ public class HandshakeRejectionEvent implements Event<String> {
 	 *
 	 * @since Envoy Common v0.3-alpha
 	 */
-	public HandshakeRejectionEvent() { this(""); }
+	public HandshakeRejectionEvent() { super(""); }
 
 	/**
 	 * Creates an instance of {@link HandshakeRejectionEvent}.
@@ -61,12 +61,5 @@ public class HandshakeRejectionEvent implements Event<String> {
 	 * @param reason the reason why the handshake was rejected
 	 * @since Envoy Common v0.3-alpha
 	 */
-	public HandshakeRejectionEvent(String reason) { this.reason = reason; }
-
-	/**
-	 * @return the reason why the handshake was rejected
-	 * @since Envoy Common v0.3-alpha
-	 */
-	@Override
-	public String get() { return reason; }
+	public HandshakeRejectionEvent(String reason) { super(reason); }
 }
diff --git a/src/main/java/envoy/event/IdGeneratorRequest.java b/src/main/java/envoy/event/IdGeneratorRequest.java
index 885f40d..fe7871d 100644
--- a/src/main/java/envoy/event/IdGeneratorRequest.java
+++ b/src/main/java/envoy/event/IdGeneratorRequest.java
@@ -11,7 +11,7 @@ package envoy.event;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.3-alpha
  */
-public class IdGeneratorRequest implements Event<Void> {
+public class IdGeneratorRequest extends Event.Valueless {
 
 	private static final long serialVersionUID = 1431107413883364583L;
 }
diff --git a/src/main/java/envoy/event/MessageStatusChangeEvent.java b/src/main/java/envoy/event/MessageStatusChangeEvent.java
index a696c36..d7e7e4a 100644
--- a/src/main/java/envoy/event/MessageStatusChangeEvent.java
+++ b/src/main/java/envoy/event/MessageStatusChangeEvent.java
@@ -12,10 +12,9 @@ import envoy.data.Message;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class MessageStatusChangeEvent implements Event<Message.MessageStatus> {
+public class MessageStatusChangeEvent extends Event<Message.MessageStatus> {
 
 	private final long					id;
-	private final Message.MessageStatus	status;
 	private final Date					date;
 
 	private static final long serialVersionUID = 4566145392192761313L;
@@ -30,8 +29,8 @@ public class MessageStatusChangeEvent implements Event<Message.MessageStatus> {
 	 * @since Envoy Common v0.2-alpha
 	 */
 	public MessageStatusChangeEvent(long id, Message.MessageStatus status, Date date) {
+		super(status);
 		this.id		= id;
-		this.status	= status;
 		this.date	= date;
 	}
 
@@ -43,13 +42,6 @@ public class MessageStatusChangeEvent implements Event<Message.MessageStatus> {
 	 */
 	public MessageStatusChangeEvent(Message message) { this(message.getId(), message.getStatus(), new Date()); }
 
-	/**
-	 * @return the status of the {@link Message} this event is related to
-	 * @since Envoy Common v0.2-alpha
-	 */
-	@Override
-	public Message.MessageStatus get() { return status; }
-
 	/**
 	 * @return the ID of the {@link Message} this event is related to
 	 * @since Envoy Common v0.2-alpha
@@ -63,5 +55,5 @@ public class MessageStatusChangeEvent implements Event<Message.MessageStatus> {
 	public Date getDate() { return date; }
 
 	@Override
-	public String toString() { return String.format("MessageStatusChangeEvent[id=%d,status=%s,date=%s]", id, status, date); }
+	public String toString() { return String.format("MessageStatusChangeEvent[id=%d,status=%s,date=%s]", id, value, date); }
 }
diff --git a/src/main/java/envoy/event/UserStatusChangeEvent.java b/src/main/java/envoy/event/UserStatusChangeEvent.java
index 1e47952..ed6e79f 100644
--- a/src/main/java/envoy/event/UserStatusChangeEvent.java
+++ b/src/main/java/envoy/event/UserStatusChangeEvent.java
@@ -11,10 +11,9 @@ import envoy.data.User.UserStatus;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-alpha
  */
-public class UserStatusChangeEvent implements Event<UserStatus> {
+public class UserStatusChangeEvent extends Event<UserStatus> {
 
-	private final long				id;
-	private final User.UserStatus	status;
+	private final long id;
 
 	private static final long serialVersionUID = 4566145392192761313L;
 
@@ -27,8 +26,8 @@ public class UserStatusChangeEvent implements Event<UserStatus> {
 	 * @since Envoy Common v0.2-alpha
 	 */
 	public UserStatusChangeEvent(long id, User.UserStatus status) {
-		this.id		= id;
-		this.status	= status;
+		super(status);
+		this.id = id;
 	}
 
 	/**
@@ -39,13 +38,6 @@ public class UserStatusChangeEvent implements Event<UserStatus> {
 	 */
 	public UserStatusChangeEvent(User user) { this(user.getId(), user.getStatus()); }
 
-	/**
-	 * @return the status of the {@link User} this event is related to
-	 * @since Envoy Common v0.2-alpha
-	 */
-	@Override
-	public User.UserStatus get() { return status; }
-
 	/**
 	 * @return the ID of the {@link User} this event is related to
 	 * @since Envoy Common v0.2-alpha
@@ -53,5 +45,5 @@ public class UserStatusChangeEvent implements Event<UserStatus> {
 	public long getId() { return id; }
 
 	@Override
-	public String toString() { return String.format("UserStatusChangeEvent[id=%d,status=%s]", id, status); }
+	public String toString() { return String.format("UserStatusChangeEvent[id=%d,status=%s]", id, value); }
 }