When an event is “complete” on the event details page, inactivate the add collaborator buttons. Currently, it appears that you can add a collaborator to a complete event, but if you try to do so then you get an error message saying that you can’t.
This is what it looked like when I tried to add Neil as a collaborator on a complete event. For a bit, it looks like Neil has been added, but there's also this error message.
When I refresh the browser and thus reload the event, Neil's name is gone.
When an event is “complete” on the event details page, inactivate the add collaborator buttons. Currently, it appears that you can add a collaborator to a complete event, but if you try to do so then you get an error message saying that you can’t.
This is what it looked like when I tried to add Neil as a collaborator on a complete event. For a bit, it looks like Neil has been added, but there's also this error message.![image](https://user-images.githubusercontent.com/49287076/189197249-12b107a9-f6d6-4c43-aa14-4072fa89ecd9.png)
When I refresh the browser and thus reload the event, Neil's name is gone.![image](https://user-images.githubusercontent.com/49287076/189197540-fa34fa5b-5eab-4994-995f-01a006a897a2.png)