Former Nirvana bassist Krist Novoselic has joined the lineup of a Sept. 20 concert in Seattle to celebrate to upcoming 20th anniversary of his former band’s breakthrough album, ‘Nevermind.’

The gig, which will take place at the Experience Music Project's Sky Church, will feature Novoselic reprising his ‘Nevermind’ bass lines as he plays the songs alongside members of Seattle groups the Fastbacks, Visqueen, Campfire OK, the Long Winters and Valis, which features members of Screaming Trees.

Tickets to the show cost $15 for EMP members and $20 for non-members, with proceeds benefiting Susie Tennant, who worked alongside Nirvana at the Sub Pop and Geffen record labels. She is currently undergoing treatment for cancer.

'Nevermind''s 20th anniversary is being feted with a deluxe reissue of the record due out Sept. 27. The set includes a remastered version of the album, live recordings, alternate mixes and studio rarities, including the so-called 'Devonshire Mixes' (the album as originally mixed producer by Butch Vig).

The original 'Nevermind' came out on Sept. 24, 1991.