diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e56d89..8ed2ad1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - createActivity mutation
 - activities table
 - event and eventCount to UserData gql interface
+- joined field to Event gql type
 
 ### Removed
 
diff --git a/src/graphql/schema.graphql b/src/graphql/schema.graphql
index 1d3e953..d7fb96e 100644
--- a/src/graphql/schema.graphql
+++ b/src/graphql/schema.graphql
@@ -405,6 +405,9 @@ 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;
+    }
 }