I'm having issues understanding what you're saying.
So you play say a birthday event and when it over, it's starts again on it's own with the goals and all ?
Or are you getting one of these key holder events with empty goals ?
I believe this is what happened (which I just experienced in game): Started a Dinner Party and it began just fine. Within a few moments all sims on the lot will reset to a short flashed T pose and stop what they are doing. The Dinner party reset with goals and music as if it was just starting but no matter what my sim did the goals would not complete. Ended the party early then sent sim to bed. The next morning the Dinner Party event randomly started again along with a key-holder event on top of it. Both events ended after just a few sim minutes and no goals were met.
I have no CC or mods of any kind in my game. I update automatically and repair game regularly along with deleting cache files. This EP is just completely infested with bugs.
To rival the spice festival, I decided to throw a party of my own (it was no rival). 🙂
I set up a House Party to run at home...
The timer counted down in the normal way and I realised that it's almost impossible to complete the challenges set on a normal lot, let alone in an apartment. When the party ended I was given my reward. However, as soon as the last guest left the timer popped back up with full time and started counting down all over again. You might be able to let it run a third or fourth time... You cannot go on to complete any of the unfinished challenges and I'm unsure if you get another reward at the end.
You can click the 'x' to shut the party down.
My report is along these lines, but a little different...
Parties do not finish properly, if at all...
@IronicBeauty do you have a save game with this going on ?
Added
