diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd8da81..40fdbcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - getActivities field to receive all activities
 - createActivity mutation
 - activities table
+- event and eventCount to UserData gql interface
+- joined field to Event gql type
+- joined field to Group gql type
 
 ### Removed
 
diff --git a/src/graphql/schema.graphql b/src/graphql/schema.graphql
index edfeabc..b4c2162 100644
--- a/src/graphql/schema.graphql
+++ b/src/graphql/schema.graphql
@@ -138,9 +138,15 @@ interface UserData {
     "The groups the user has joined"
     groups(first: Int=10, offset: Int=0): [Group]
 
-    "The numbef of groups the user has joined"
+    "The number of groups the user has joined"
     groupCount: Int!
 
+    "The events the user is participating in"
+    events(first: Int=10, offset: Int=0): [Event]
+
+    "The number of events the user is participating in"
+    eventCount: Int!
+
     "the points of the user"
     points: Int!
 
@@ -189,6 +195,12 @@ type User implements UserData{
     "The numbef of groups the user has joined"
     groupCount: Int!
 
+    "The events the user is participating in"
+    events(first: Int=10, offset: Int=0): [Event]
+
+    "The number of events the user is participating in"
+    eventCount: Int!
+
     "the levels of the user depending on the points"
     level: Int!
 }
@@ -251,6 +263,12 @@ type Profile implements UserData {
     "The numbef of groups the user has joined"
     groupCount: Int!
 
+    "The events the user is participating in"
+    events(first: Int=10, offset: Int=0): [Event]
+
+    "The number of events the user is participating in"
+    eventCount: Int!
+
     "the points of the user"
     points: Int!
 
@@ -370,6 +388,9 @@ type Group {
 
     "the events of the group"
     events(first: Int=10, offset: Int=0): [Event!]!
+
+    "If the user with the specified id has joined the group"
+    joined(userId: Int!): Boolean
 }
 
 type Event {
@@ -387,6 +408,9 @@ type Event {
 
     "The participants of the event."
     participants(first: Int=10, offset: Int=0): [User!]!
+
+    "Returns if the user with the specified id has joined the event"
+    joined(userId: Int!): Boolean
 }
 
 "respresents an access token entry with the value as the acutal token and expires as the date the token expires."
diff --git a/src/lib/models/Event.ts b/src/lib/models/Event.ts
index efd069d..37858c8 100644
--- a/src/lib/models/Event.ts
+++ b/src/lib/models/Event.ts
@@ -24,13 +24,30 @@ export class Event extends Model<Event> {
     @BelongsToMany(() => User, () => EventParticipant)
     public rParticipants: User[];
 
+    /**
+     * Returns the group the event belongs to
+     */
     public async group(): Promise<Group> {
         return await this.$get("rGroup") as Group;
     }
 
+    /**
+     * Returns the participants of the event
+     * @param first
+     * @param offset
+     */
     public async participants({first, offset}: {first: number, offset: number}): Promise<User[]> {
         const limit = first ?? 10;
         offset = offset ?? 0;
         return await this.$get("rParticipants", {limit, offset}) as User[];
     }
+
+    /**
+     * Returns if the specified user has joined the event
+     * @param userId
+     */
+    public async joined({userId}: {userId: number}): Promise<boolean> {
+        const participants = await this.$get("rParticipants", {where: {id: userId}}) as User[];
+        return participants.length !== 0;
+    }
 }
diff --git a/src/lib/models/Group.ts b/src/lib/models/Group.ts
index 7bf801f..8b3fd7f 100644
--- a/src/lib/models/Group.ts
+++ b/src/lib/models/Group.ts
@@ -47,29 +47,59 @@ export class Group extends Model<Group> {
     @HasMany(() => Event, "groupId")
     public rEvents: Event[];
 
+    /**
+     * Returns the creator of the group
+     */
     public async creator(): Promise<User> {
         return await this.$get("rCreator") as User;
     }
 
+    /**
+     * Returns the list of admins with pagination
+     * @param first
+     * @param offset
+     */
     public async admins({first, offset}: { first: number, offset: number }): Promise<User[]> {
         const limit = first ?? 10;
         offset = offset ?? 0;
         return await this.$get("rAdmins", {limit, offset}) as User[];
     }
 
+    /**
+     * Returns the list of members with pagination
+     * @param first
+     * @param offset
+     */
     public async members({first, offset}: { first: number, offset: number }): Promise<User[]> {
         const limit = first ?? 10;
         offset = offset ?? 0;
         return await this.$get("rMembers", {limit, offset}) as User[];
     }
 
+    /**
+     * Returns the chat that belongs to the group
+     */
     public async chat(): Promise<ChatRoom> {
         return await this.$get("rChat") as ChatRoom;
     }
 
+    /**
+     * Returns all group events with pagination
+     * @param first
+     * @param offset
+     */
     public async events({first, offset}: { first: number, offset: number }): Promise<Event[]> {
         const limit = first ?? 10;
         offset = offset ?? 0;
         return await this.$get("rEvents", {limit, offset}) as Event[];
     }
+
+    /**
+     * Returns if a user has joined the group
+     * @param userId
+     */
+    public async joined({userId}: {userId: number}): Promise<boolean> {
+        const members = await this.$get("rMembers", {where: {id: userId}}) as User[];
+        return members.length !== 0;
+    }
 }