The Conners stint marks a reunion for onetime National Lampoon’s Christmas Vacation siblings Galecki. Maya Lynne Robinson, Jun 7, 2016. Released on July 29, 1983, National Lampoon's Vacation became a monster hit, spawning four sequels: European Vacation, Christmas. This rom-com has a pretty solid cast, including Cameron Diaz. are an unmarried couple who have to attend four different fa. In 1983, a little road trip comedy was released that set…