nerd prom
n.— «Comic-Con, the nation’s largest celebration of comic books and pop culture, has descended on the San Diego Convention center. It’s when superheroes walk the streets, artists and animators are treated like A-listers, and fantasy reigns. “It’s fondly referred to as nerd prom.”» —“Industry salutes comic heroes” in San Diego, California St. Petersburg Times (Florida) July 21, 2006. (source: Double-Tongued Dictionary)