party down
To celebrate, revel, or make merry at or as at a party. I partied down with all sorts of celebrities in my time as a tour manager. We're partying down at Jane's house this weekend—you should come along!
party hearty
To engage in a very lively, raucous celebration. I've been busting my hump all week studying for my exams on Friday, so I'm going to party hearty after they're all done! I know she partied hearty on Sunday for her birthday, so she might not be in the best form this morning.