The remaining members of the Grateful Dead - Mickey Hart, Phil Lesh, and Bob Weir, joined by Jackie Greene, John Molo, and Steve Molitz - are performing in a live webcast tonight (February 4) at 7:30 pacific time (that's 10:30 here) as part of their "Dead Heads for Obama" campaign.
If you want to tune in, here's the address. You'll need Windows Media Player to watch the show.