There were pops of “Wicked” green and “Sweeney Todd” red among the whiteout conditions in Manhattan over the weekend at the first BroadwayCon, a theater-themed fan convention that hopes to do for Broadway devotion what Comic-Con International, in San Diego, has done for superhero worship. Nearly 6,000 people from around the world, most of them young women, turned out for the three-day event at the New York Hilton Midtown, according to event organizers.

Despite the massive storm that shut down Broadway on Saturday and forced the cancellations of appearances by several high-profile celebrities at BroadwayCon, including the actors Darren Criss and Jeremy Jordan, the show went on, with panel discussions, singalongs and a Saturday night cabaret that turned a ballroom into a theater camp-style slumber party.

Not to be outdone by their Comic-Con counterparts, many attendees came dressed as their favorite Broadway musical characters for impromptu cosplay, or “costume play” for the uninitiated.

There were also group phone calls with the Broadway luminaries Patti LuPone and Tommy Tune, a spirited reunion with original “Rent” cast members, and a freestyle rap from Lin-Manuel Miranda, the “Hamilton” creator, that sent the crowd into a frenzy. Here are some scenes from the event, which organizers say they hope to repeat next year.