Fool's party

An alcohol-heavy party in the middle of the week for no particular reason.

-Josh you look horrible!
-Yeah I was at fool's party yesterday.

-On a tuesday? What was the occasion?

-There was no occasion. Werw you not listening? It was a fool's party

party fool

something that’s unacceptable done at a party

he just did a backflip into a shark! what a party fool!