Prom?

I'm not sure where to put this but I loved taking my sims to prom and now I can't get any of them to prom.

It's not showing up on my Calander, and I have only received one before party invite between playing with three different family's.

  The only clue I had to prom even happening is because of the social bunny phone app.

I have tried so many different ways of fixing it.

Can someone fix this?