I usually do the "three gourmet dishes at a single event" as an ungoaled dinner party, since otherwise the "dungeon master" stands around telling you to make garden salads and tell jokes. Nah fam I'm good, I just want to cook gourmet dishes. You need to do all three gourmet dishes at the same dinner party.
And Party Animal is a little buggy. First, only certain events--House Party, Black and White Party, Dinner Party, Birthday Party (but not toddlers I think?), and Wedding--count, and I usually only do the first three. Also, apparently if your Sim is not the active Sim when the party ends--like, if your Sim's spouse is making drinks or something and they're the "active Sim" instead of the one doing the aspiration--your Sim doesn't get credit for the party. Sometimes I think they only test things in single-Sim households. (Sometimes I need to tell another household member to leave that cowplant alone and not eat the cake, and instead have the lovely gourmet dishes we've created.)
Dates count as social events for Party Animal, by the way!