There’s nothing written in stone about improv comedy being a young person’s game, but more often than not it turns out that way. For actors who’ve reached a certain level of prominence in their careers, it would seem that the prospect of stepping into the semi-masochistic world of show shirts and class levels and 10:30 PM midweek showtimes could be prohibitively off-putting.

Upcoming guests such as Amy Morton (9/8) and Michael Shannon (9/15) need little promotion, but audiences would also do well to nab tickets to the sets featuring spectacularly funny actors Atra Asdou (8/31) and Sadieh Rifai (9/14).   v

Through 9/15: Fri-Sat 7:30 PM, Filament Theatre, 4041 N. Milwaukee, 773-270-1660, filamenttheatre.org, $10 (Michael Shannon show sold out).