CAMBRIDGE — If 8:30 p.m. on a Monday seems like an inopportune time for a dance party, nobody bothered to tell Disclosure fans, who shed their parkas and crammed into the sold-out Sinclair for the first Boston appearance of the UK electronic duo.

Though quite young, the brotherly team of Guy and Howard Lawrence (age 21 and 18, respectively) have demonstrated a unique understanding of the textures and nuances of classic mid-’90s UK house, along with a savvy knack for updating that sound to meet the demands of today’s clubgoers, who crave bigger bass and more death-defying drops.