If you’ve been lucky enough to attend a wedding where The Engagements are playing, you know they kill on the dance floor with their infectious covers of 80s staples by The Smiths, MJ, The Cars and the like. (The 10-piece band includes several talented vocalists and excellent musicians, making it easy for them to segue from, say, Neneh Cherry’s “Buffalo Stance” to Flock of Seagull’s “I Ran.”) And Friday night at 9:30, they’re headlining their first non-nuptial show in the front room of The Bell House--the “Don’t You Forget About Me 80s Dance Party”— so you don’t have to wait for an invite. (Tickets are $7 in advance/$10 at the door.) Make an entire night of it, and catch the 7:30 Louis C.K. show in the Main room beforehand.