Bowie in spandex, uncensored puppets, fake docents, and celebrity riffers are all things you can expect from SF Sketchfest's Summer Nights series, happening now through August 27. The series started last night with two sold-out Reggie Watts shows at the Independent, and advance tickets to the rest of the shows are sure to sell out, too. So act now! Here are a few highlights:

Hit up Curran Theatre for the limited-engagement SHN production of Stuffed and Unstrung, an "uncensored" performance featuring 80 Henson puppets and 6 comedians in an uninhibited and unscripted live puppet performance that Entertainment Weekly describes as "one giant Mad Lib". The show opens tonight and runs through August 27.

Also happening tonight is SF Sketchfest at NightLife, "Weird Science: An Evening of Comedy, Science and 1980's Culture," which will include a live Nerdist Podcast with Chris Hardwick and guest Veronica Belmont (Tekzilla, Qore), stand-up by Adam Savage (Mythbusters) and host Brian Malow, fake docent tours with Kasper Hauser, and Previously Secret Information storytelling by Joe Klocek.

On Saturday night, Castro Theatre plays host to a stellar pair of events. Get all Bowied up for the 25th Anniversary Celebration of Labyrinth, featuring a costume party and a live and in person conversation with puppeteers of Labyrinth, Muppet and Jim Henson Company fame: Brian Henson (“Hoggle,” “Sal Minella”), David Goelz (“Sir Didymus,” “Gonzo the Great,” “Dr. Bunson Honeydew”) and Karen Prell (“The Worm,” “The Junk Lady,” “Red Fraggle”), hosted by Adam Savage of Mythbusters.

Next up on Saturday is Night of the Shorts II: Electric Riffaloo with Kevin Murphy and Bill Corbett from Mystery Science Theater 3000, along with an impressive line-up of guests, including Chris Hardwick, Bob Odenkirk, Andy Richter, Adam Savage, Cole Stratton and Janet Varney riffing on the worst instructional, PSA, nature, science and safety videos that could be found.

These events are sure to make you laugh so hard you'll forget it's 55 degrees and misting in August!