Hmm, I think I know what you're talking about now.
Those cakes that usually don't let Sims grab slices from until after the event end. So you want these cakes (from Buy Mode perhaps?) enabled for Sims to grab slices from like regular cakes which can be baked?
Exactly! I probably should have specified Buy Mode Cakes ("special event") cakes. I'd like them to be useable even when I don't have a Birthday or Wedding.