Hey Philip,
I’m sorry you are disappointed. There is no generic solution to this yet because until now we didn’t receive any issues / requests with having 3 events at exactly the same time, so nobody reported this missing feature. I will open an internal ticket for this, so hopefully it will make it to a future release and then no special coding will be required.
On your new issue, I’m not quite sure what I’m supposed to see. Here’s a screenshot:

I see one event there, the last FTF event in August which is part of the FTF recurring event with the slug ftf-vor-seminar-08-16.
On the main calendar view I see all 3 events (FTF, FTF yellow, FTF junior) in the calendar next to each other on August 24.
Can you send some more details on the issue?
Thanks,
Andras