Rebecca Rubin Film and Media Reporter“They’re coming out of the woodwork!”Jennifer Lopez is gushing in delight as an impromptu flash mob breaks out — to the tune of “Jenny From the Block,” naturally — on the red carpet of “Halftime,” her new documentary that opened the 2022 Tribeca Festival. “Only in New York,” she said, letting out a “woo.”the woman of the hour, @jlo, watching in delight as a flash mob breaks out on the red carpet at the #Halftime world premiere pic.twitter.com/vHxShRTTxx— Rebecca Rubin (@rebeccaarubin) June 9, 2022Wednesday’s world premiere doubled as a homecoming, of sorts, for the global icon, who grew up only a few blocks from the United Palace in Washington Heights, where the movie played to 3,000 mostly maskless and always enthusiastic audience members.