From the Facebook event:

Maple Stave: Durham-based, 12 years old, very loud, kinda mathy and shouty. We like playing music. And we like you. New full length album coming early 2016.

Knife the Symphony: Hailing from Cincinnati, “Knife The Symphony has consistently released energetic, abrasive, rhythmic-work garnering comparisons to Hüsker Dü, Drive Like Jehu, Jawbox, and Unwound. The band owes a considerable debt to Dischord, SST and Touch & Go. Bring your earplugs.”

Nonagon: From Chicago, “Nonagon is a 3-piece, punk rock concern that formed in 2003 and practices in the Logan Square neighborhood of Chicago. They are the proud purveyors of a loud set of short songs that have unconventional hooks.

Three more things:

1) They have three EPs under their belt (the latest on Controlled Burn Records).
2) They love to play shows but still have no idea how to dress for them.
3) They are big fans of minivans with stow-and-go seats.

So, I think we all agree that earplugs are necessary.