From Wikipedia: The drive-in theater was patented by Camden, New Jersey, chemical company magnate Richard M. Hollingshead, Jr., whose family owned and operated the R.M. Hollingshead Corporation chemical plant in Camden. In 1932, Hollingshead conducted outdoor theater tests in his driveway at 212 Thomas Avenue in Riverton. After nailing a screen to trees in his backyard, he set a 1928 Kodak projector on the hood of his car and put a radio behind the screen, testing different sound levels with his car windows down and up. Blocks under vehicles in the driveway enabled him to determine the size and spacing of ramps so all automobiles could have a clear view of the screen. In 1921, however, a more public drive-in was created by Claude V. Caver in Comanche, Texas. Caver obtained a permit from the city to project films downtown and cars parked bumper to bumper to witness the screening of silent films from their vehicles. Following the experiments of Caver and Hollingshead, it was Hollingshead who applied August 6, 1932, for a patent of his invention, and he was given U.S. Patent 1,909,537 on May 16, 1933.
Hollingshead's drive-in opened in New Jersey June 6, 1933 ... in Pennsauken, a short distance from Cooper River Park. Rosemont Avenue now runs through the prior location. It offered 400 slots and a 40 x 50 ft (12 x 15 m) screen. He advertised his drive-in theater with the slogan, "The whole family is welcome, regardless of how noisy the children are." The first film shown was the Adolphe Menjou film Wife Beware. The facility only operated three years, but during that time the concept caught on in other states.

Meet at Sonic @ 7:30pm for an hour-long get-together before driving nextdoor to the Drive-in @ 8:30pm (sunset is roughly at 9pm).
You don't have to attend Sonic AND the Drive-in Movie to earn attendance at this cache event - but if you only catch a movie afterwards, please be on your honor and provide some sort of proof that you attended on 6.6: a pic in your log entry or snapshot of your Redwood Drive-in receipt from 6.6 would be great!
If the weather is terrible, we will just keep the event to a Sonic Meet&Greet.
For Prices, Showtimes and Directions & more, please visit the Redwood Road Drive-in's website.