that could be a hat party
this one is pretty zen. if you see something that could be a hat, put it on your head. then come to the party!
black-light zip-line joust party
people with enormous neon foam bats, zip-lining at each other from opposite ends of a large room with one chance to really WAM each other - in crazy neon costumes! in the dark! this party has the added benefit of two compound words in its title.
Of course, Anna using "Ollie" in a sentence is a party right there.