The following description comes from the event organizer.

Calling all skeletons, there's a party at Holocene - so storm through it like your name is El Niño. Remember that old Get Up Kids shirt that's gathering dust in the back of your closet? It's time to dig it out, lace up your chucks, and come down to Holocene to sing along to your favorite emo jams from the late 90's and mid 00's.
Let's make damn sure everyone knows we're gonna stay 18 forever. (the party is 21+ though...) We'll capture photographs as proof that you were screaming infidelities at the top of your lungs all night.