DANNY CLINCH Pearl Jam (from left, Matt Cameron, Jeff Ament, Eddie Vedder, Stone Gossard and Mike McCready). Pearl Jam has added a Sept. 14 concert at the Waterfront Music Pavilion (formerly the BB&T Pavilion) in Camden to its 2022 tour, which consists mostly of shows postponed from 2020. There will be a Verified Fan Onsale, March 29 at 10 a.m.; visit Ticketmaster.com. The band’s Sept. 11 concert at Madison Square Garden was previously announced and is already sold out. Josh Klinghoffer will open these shows with his solo project, Pluralone. Klinghoffer is a touring member of Pearl Jam as well…