diff --git a/src/main/java/mops/gruppen2/repository/EventRepository.java b/src/main/java/mops/gruppen2/repository/EventRepository.java
index bb9947b..87029c1 100644
--- a/src/main/java/mops/gruppen2/repository/EventRepository.java
+++ b/src/main/java/mops/gruppen2/repository/EventRepository.java
@@ -1,9 +1,18 @@
 package mops.gruppen2.repository;
 
 import mops.gruppen2.domain.EventDTO;
+import org.springframework.data.jdbc.repository.query.Query;
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
 @Repository
 public interface EventRepository extends CrudRepository<EventDTO, Long> {
+    @Query("select distinct group_id where user_id =:id")
+    List<Long> findGroup_idsWhereUser_id(@Param("id") Long user_id);
+
+    @Query("select * where group_id =:id")
+    List<EventDTO> findEventDTOByGroup_id(@Param("id") Long group_id);
 }
diff --git a/src/main/java/mops/gruppen2/service/GroupService.java b/src/main/java/mops/gruppen2/service/GroupService.java
index c9ab19d..d08b532 100644
--- a/src/main/java/mops/gruppen2/service/GroupService.java
+++ b/src/main/java/mops/gruppen2/service/GroupService.java
@@ -1,12 +1,13 @@
 package mops.gruppen2.service;
 
-import lombok.EqualsAndHashCode;
+import mops.gruppen2.domain.EventDTO;
 import mops.gruppen2.domain.Exceptions.EventException;
 import mops.gruppen2.domain.Exceptions.GroupDoesNotExistException;
 import mops.gruppen2.domain.Group;
 import mops.gruppen2.domain.event.CreateGroupEvent;
 import mops.gruppen2.domain.event.DeleteGroupEvent;
 import mops.gruppen2.domain.event.Event;
+import mops.gruppen2.repository.EventRepository;
 import org.springframework.stereotype.Service;
 
 import java.util.ArrayList;
@@ -18,9 +19,20 @@ import java.util.Map;
 public class GroupService {
 
     private final EventService eventService;
+    private final EventRepository eventRepository;
 
-    public GroupService(EventService eventService) {
+    public GroupService(EventService eventService, EventRepository eventRepository) {
         this.eventService = eventService;
+        this.eventRepository = eventRepository;
+    }
+
+    public List<Event> getGroupEvents(List<Long> group_ids) {
+        List<EventDTO> eventDTOS = new ArrayList<>();
+        List<Event> events = new ArrayList<>();
+        for (Long group_id: group_ids) {
+            eventDTOS.addAll(eventRepository.findEventDTOByGroup_id(group_id));
+        }
+        return null;
     }
 
     public List<Group> projectEventList(Map<Long, Group> groupMap, List<Event> events) throws EventException {
diff --git a/src/main/java/mops/gruppen2/service/UserService.java b/src/main/java/mops/gruppen2/service/UserService.java
new file mode 100644
index 0000000..e296b67
--- /dev/null
+++ b/src/main/java/mops/gruppen2/service/UserService.java
@@ -0,0 +1,25 @@
+package mops.gruppen2.service;
+
+import mops.gruppen2.domain.EventDTO;
+import mops.gruppen2.repository.EventRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class UserService {
+
+    final EventRepository eventRepository;
+
+    public UserService(EventRepository eventRepository) {
+        this.eventRepository = eventRepository;
+    }
+
+    public List<Long> getUserGroups(Long user_id) {
+        List<Long> group_ids = eventRepository.findGroup_idsWhereUser_id(user_id);
+
+        return null;
+    }
+}
diff --git a/src/test/java/mops/gruppen2/service/GroupServiceTest.java b/src/test/java/mops/gruppen2/service/GroupServiceTest.java
index bde1fc0..a3bdfaa 100644
--- a/src/test/java/mops/gruppen2/service/GroupServiceTest.java
+++ b/src/test/java/mops/gruppen2/service/GroupServiceTest.java
@@ -1,7 +1,6 @@
 package mops.gruppen2.service;
 
 import mops.gruppen2.domain.Exceptions.GroupDoesNotExistException;
-import mops.gruppen2.domain.Exceptions.UserNotFoundException;
 import mops.gruppen2.domain.Group;
 import mops.gruppen2.domain.GroupType;
 import mops.gruppen2.domain.Visibility;
@@ -9,26 +8,24 @@ import mops.gruppen2.domain.event.AddUserEvent;
 import mops.gruppen2.domain.event.CreateGroupEvent;
 import mops.gruppen2.domain.event.DeleteGroupEvent;
 import mops.gruppen2.domain.event.Event;
+import mops.gruppen2.repository.EventRepository;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.mockito.configuration.IMockitoConfiguration;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.mock;
 
 class GroupServiceTest {
     GroupService groupService;
+    EventRepository eventRepository;
 
     @BeforeEach
     public void setUp() {
-        groupService = new GroupService(mock(EventService.class));
+        groupService = new GroupService(mock(EventService.class), eventRepository);
     }
 
     @Test