1. Select 
Groups
2. Select the group you would like to delete an event in
3. Select the Events tab
4. Select the event you would like to delete
5. Select Settings
6. Select 
Delete This Event
1. Tap 
Communities
2. Select the group you would like to delete an event in
3. Tap 
4. Tap Events
5. Select the event you would like to delete
6. Tap
7. Tap Delete This Event
1. Tap Communities
2. Select the group you would like to delete an event in
3. Tap
4. Tap Events
5. Select the event you would like to delete
6. Tap
7. Tap Delete This Event