Come one, come all (unless you’re under 21) to Petaluma this Sat/20, and witness death-defying displays -- with a twist. A screw-top twist, that is (sorry). Attendees of the Lagunitas Beer Circus can “ooh” and “aah” at aerialist acts, laugh at outrageously face-painted clowns, watch a lithesome figure breathe fire or swallow swords, and gape at the magnificence of exotic burlesque dancers, all the while drinking the fine beers and sweet ales of Lagunitas. It'll be three rings of tastiness! And it's charitable.