Krist Novoslic has confirmed a one-off gig to celebrate the 20th anniversary of classic grunge album Nevermind.
To take place in Seattle, Nirvana home country, on September 20th.
All proceeds will go to Susie Tennant - a music industry figure who was recently diagnosed with cancer.
Novoselic wil be joined by a whole host of local musicians reports Rolling Stone but former Nirvana Drummer Dave Grohl is not believed to be involved.
Foo Fighters will be performing elsewhere in the country that night.
Meanwhile plans for a Nirvana exhibition in London have been unveiled as part of the anniversary celebrations - find out more.