“Christopher Walken falls off a ladder in Russia and is unable to perform his Chekhov-inspired solo show. Karen, who apparently proofread the script once, is asked to go on in Walken’s place.” This is the plot synopsis for There There, the acclaimed theatrical venture directed by Paul Willis, designed by Peter Ksander, and written and performed by Kristen Kosmas. If that last name sounds familiar: In the 1990s, Kosmas was the brightest light of Seattle’s blooming performance-art scene. Now she’s the creator of the brain-bending show the New York Times hailed as a “language-drenched, resonant knockout.” Do not miss it. ( On the Boards, 100 W Roy St, ontheboards.org, 8 pm, $20, Jan 9–12)