Do you mean, that an event should only come once?
If that's right, you only have to put(??) a "Switch" after that Event. Then you must click on "New Page" and choose the Switch which you made in the left upper corner of the Event page. Then you can write, what's next after the Event finished.
I hope, i could help you.

--Bitte schlagt mich nicht wegen meines Englisch---