Disney’s premiere of “Dinosaur” on Saturday was a big event in more ways the one.Some of the biggest stars at the bash were the prehistoric creatures themselves. A 9-foot pteranodon, an 11-foot pterosaur, two 18-foot Tyrannosaurus rex, a 6-foot stegosaur and a spitting 8-foot dilophosaur blocked traffic on Hollywood Boulevard in front of the El Capitan Theatre to greet guests on their walk down the carpet to the screening. Later, at the kid-filled post-preem soiree, pic’s voice stars D.B. Sweeney, Alfre Woodard, Hayden Panettierre and Peter Siragusa partied with other premiere guests, wandering from room to room filled to bursting with prehistoric-themed food, activities and wall-to-wall dinos. Among those playing like kids were pic’s helmers Eric Leighton and Ralph Zondag; producer Pam Marsden and co-producer Baker Bloodworth; composer James Newton Howard; Disney execs Michael Eisner, Roy Disney, Richard Cook, Bob Iger and Thomas Schumacher; plus guests Patricia Arquette, Danny Bonaduce, Michael Chiklis, David Hasselhoff, Larry and Shauna King, Elizabeth Pena, Ingo Rademacher, Leah Remini, Rick Schroeder, Ryan Stiles, Michelle Trachtenberg and Hunter Tylo.