Beach Blanket Batgrrl

Inspired by the campy 1960’s Batgirl, a librarian by day and a masked superhero by night, the comic nerds of Geeks Out and the librarians of Que(e)ry have joined forces to throw the biggest queer geek bash of the summer: Beach Blanket Batgrrl. Grab a drink from One Last Shag’s retro tiki bar, dance the night away to Disco, Motown, and more with DJs Meridian, Tubby Lambergini, and Big Ragoo, and mingle on the beach patio under the stars of Gotham City. 

Also, the answer to your question regarding costumes: Yes.