Talent Showcase Conflict

Hi everyone, 

I am trying to plan wedding events over the weekend for my Sims, but I cannot plan an event because of the talent showcase, I am guessing. The button to add an event is completely greyed out because it says I can't have two events on the same day. Is there a way to disable the talent showcase? I tried deleting the lot it was on, but it just changed lots. 

TIA!