Some party goals won't complete if you have a club gathering active at the same time. Call to meal for a dinner party is the one I remember. Worth a check if you haven't already.
I don't have the DLC with clubs so this should not affect me (hopefully).
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The sim making a toast must have a drink in their hand, then click on another sim and "Make a Toast" will be under Friendly interactions. It's always a tricky one because the sim who is supposed to make the toast will often finish their drink before the interaction completes.
Okay, I really haven't the idea of going through dozens of friendly interactions while having a sim drinking. I'll try it the next time and hope I find it. I'll make sure some other sim is close when I try it.
I'll report back if it worked, though it might take a while before there's the next birthday in my save. In the meantime, thanks for the tips.