Birthday parties. Cool ones, at least.

Adventuring parties, obviously.

As long as you have a cleric you're good.

Sounds like the parties you go to may be way above my budget level - both monetarily and socially.

Maybe you are the outlier. Most people are not New York socialites, and aren't in college wandering into frat parties. Or perhaps there are many different ways people live, and "cocktail" parties are just one of them?