See things you can't un-see at Petaluma's 10th anniversary Beer Circus. This event will include beer from Lagunitas and other local breweries, live music and freaktacular entertainment, including a burlesque show, aerialists and live shows from over 100 performers. The event is strictly 21 and over, no exceptions. Public transportation is suggested. Check in is at 4:20 p.m. Once you're checked in, you'll get your first beer and be treated to some pre-show entertainment.