The 6th Street Improv comedy troupe competes against four other bands of zanies in its Theatresports Invitational competition, running the next two weekends in the Studio at 6th Street Playhouse, 52 W. Sixth St., Santa Rosa.

All sessions start at 8 p.m. Admission: $14. Information: www.6thstreetplayhouse.com,  (707) 523-4185.

The line-up:

Friday, April 15 — 6th Street Improv vs. World’s Biggest Comedy Duo.
Judges: Sue Bonzell, KZST Radio; John Moran, Arts Council of Sonoma County; Clark Lewis, artistic director of Roustabout Theater Company.

Saturday, April 16 — 6th Street Improv vs. Slip Goose Monkey.
Judges: Susan Gorin, Santa Rosa City Council; Roland Jacopetti, KRCB Radio; Mary Keith Roberts, Santa Rosa Recreation and Parks Deptartment.

Friday, April 22 — 6th Street Improv vs. Simps.
Judges: Rob Singleton, KJZY Radio; Robin Pressman, KRCB Radio; Gretchen Giles, publicist at O’Reilly Media.

Saturday, April 23 — 6th Street Improv vs. Marinprov.
Judges: Chris Smith, Press Democrat columnist; Greg and Suzanne Angeo, entertainment reviewers for All Events.