The Rozzie Square Theater
Time Out says
Improv Jones Boston has made its home at the Riot Theater in Jamaica Plain for over a decade, eventually establishing itself as a nonprofit so as to better support burgeoning performers. Catch regular standup, competitive improv (more brutal than an MMA match), and ComedySportz, a PG-rated show deemed appropriate for ages 7 and up (maybe your niece is the next Melissa McCarthy?).