Sub Pop Records will celebrate its 20th birthday with a July 12-13 party at Seattle's Marymoor Park, featuring performances by bands from throughout the indie label's storied past and present.

Sub Pop Records will celebrate its 20th birthday with a July 12-13 party at Seattle's Marymoor Park, featuring performances by bands from throughout the indie label's storied past and present.

Among the groups reuniting or breaking long hiatuses for the occasion are Green River, Red Red Meat, the Fluid, Beachwood Sparks and Seaweed. Current label acts confirmed to appear include Fleet Foxes, Flight of the Conchords, Foals, Grand Archives, the Helio Sequence, Iron & Wine, Kinski, Low, Mudhoney, No Age, Wolf Parade, Pissed Jeans and the Ruby Suns.

Additional bands will be added to the bill, tickets for which go on sale April 26. As an adjunct to the music, a comedy night will be held July 11 at the Moore Theatre, featuring Patton Oswalt, Eugene Mirman, Todd Barry and other guests.

For Jeff Ament, who played in Green River with Stone Gossard before they left to form Mother Love Bone and then Pearl Jam, the show will be a chance to dig back into his shared history with Mark Arm and Steve Turner, who went on to form Mudhoney.

"There's been a few emails exchanged and a few jokes about how we'll get our hair that big and long again," he tells Billboard.com. "We might all have to go in for weaves. If we got together and wrote a couple of songs and put out a single, that'd be more important to me than playing a show; just getting in a room together."