Party at the Pen: The Masquerade, presented by Terror Behind the Walls, will return on Saturday, May 17.

I have never gone to this but it sounds fun.

“Gates to some of the dark, otherwise-off-limits corridors of the abandoned prison will be momentarily unlocked. When a masked gentleman offers his outstretched hand and asks, “Are you feeling adventurous?” make haste and follow him on a thrilling journey through Eastern State’s storied past.”

$75 bux gets you Beer, wine, specialty cocktails, Light fare, Live entertainment, and “Mysterious adventures”