Improv comedy skeptics, who might think the improvisers make it up beforehand, can rest assured that won’t be happening Thursday at the Wilbur Theatre, when former “Saturday Night Live” cast members Rachel Dratch and Horatio Sanz headline the “Queens of Comedy” show with some Upright Citizens Brigade regulars to kick off the four-day Women in Comedy Festival. The pair are old pals with roots in the Chicago improv scene, but they haven’t seen each other in a while, much less rehearsed anything.
“We’ll probably hit the theater and have a quick discussion backstage,” Lexington native Dratch says by phone. “It’s usually the same kind of thing, long-form [improv]: You get one suggestion from the audience and you just kind of go. There’s not a lot of structure to it.”