Weekend Picks: Ke$ha, Rooftop Films and more

Final weekend for Rooftop Films
Enjoy a balmy summer night under the stars while taking in free movies this weekend — the last of Rooftop Films’ summer series. (Fri-Sat., Old American Can Factory in Gowanus, rooftopfilms.com)

Jazz Age Lawn Party
Channel your inner flapper or Gatsby as Michael Arenella and his Dreamland Orchestra transport you to the 1920s. A rain date is scheduled for Sept. 18 — check the website, below, for updates. (Sat., 11 a.m., $7-$10, Governors Island, dreamlandorchestra.com)

Rockaway Nostalgia Ride
Experience the Rockaways the old-fashioned way. Weave through transit history with a vintage-train ride, followed by an old-timey bus trip to Rockaway Park. (Sat., 10 a.m., $20-$50, meet at the New York City Transit Museum, mta.info/mta/museum)

Parked! Food Truck Fest
More than 30 of New York’s favorite food trucks — Big D’s Grub, Coolhaus, Cupcake Crew, Gorilla Cheese Truck) will be conveniently parked in one place. (Sat., 10 a.m., South Street Seaport, meanredproductions.com).

Ke$ha in concert
As part of her appropriately named Get Sleazy tour, the pop singer promises even more glitter and an abundance of blue lipstick. (Fri., 7:30 p.m., PNC Bank Arts Center; Sat., 7:30 p.m., Nikon at Jones Beach Theater)