Frankenstein Follies at Bay Street Theatre, 1 Bay Street, Sag Harbor. 7:30 p.m. Oct. 25; 2:30 and 7:30 p.m. Oct 26; 2 p.m. Oct. 27.  A Halloween-themed musical revue directed and choreographed by Helene Leonard, featuring all of your favorite monsters and ghouls, with a cast of local young performers, benefitting Stages, A Children’s Theater Workshop. [$15] 631.725.9500  |  baystreet.org