The Occupy Wall Street movement is about to celebrate its first anniversary -- and Tom Morello will be on hand to help commemorate the occasion with a free concert in New York on Sunday (Sept. 16).

The Rage Against the Machine guitarist is scheduled to be part of a bill that includes former Dead Kennedys frontman Jello Biafra, comedian/activist Lee Camp and hip-hop duo Rebel Diaz, among others. The event, set to take place in Manhattan's Foley Square from 1-6 PM, is intended to be not only a celebration of the Occupy movement's work over the past year, but an exhortation for continuing efforts; as the concert poster puts it, "join us to kick off Year II."

Morello, one of the most outspoken mainstream rock musicians of the last 20 years, has been an ardent Occupy supporter over the last year, appearing at multiple rallies on both coasts while also making time to join in other political protests. But all that social awareness hasn't impeded his musical efforts; he's popped up in the studio and on stage regularly over the last year, appearing with established artists (such as Bruce Springsteen) and new groups like Outernational.