The Grammy-winning Kronos Quartet are known as much for their vast repertoire as for playing offbeat venues, but even in eclectic settings—inside the Ann Hamilton tower last year at Oliver Ranch, say—the group maintains an air of artistic highbrow. Then every once in a while they play an outdoor barbecue at Rancho Nicasio, and all ties are loosened. This Sunday’s afternoon program is unannounced, so the casual setting should spill into the anything-goes performance. Bust out your cutoffs and throw back a brewskie to this killer avant-garde string quartet on Sunday, Aug. 1, at Rancho Nicasio. Town Square, Nicasio. 4pm. $27–$30. 415.662.2219.