Jerry Garcia would have turned 70 on Aug. 1, and to mark the occasion, two days after his birthday members of the Grateful Dead family are throwing an online musical party that will be a live free webcast in HD from bandmate Bob Weir's TRI Studios in San Rafael.

Actor Luke Wilson ("The Royal Tannenbaums," "Old School," "Bottle Rocket") has signed on to emcee the show, billed as "Move Me Brightly," after a line in the Garcia/Robert Hunter song "Terrapin Station."

Carlos Santana will honor his fellow guitar great via a video interview. David Crosby's poetic tribute, "Cause I'm Missing Him Tonight," written specifically for his old friend, will be read during the show. Garcia's daughters, his brother, Tiff and ex-wife Carolyn "Mountain Girl" Garcia will be on hand, as will the world's tallest Deadhead, Bill Walton.

Weir heads a growing lineup of musicians who will perform, including Willie Nelson's son Lukas Nelson, Joe Russo and Jeff Chimenti from Furthur, Mike Gordon of Phish, Paul Simon's son Harper Simon, psychedelic folk musician Jonathan Wilson and Bay Area singer-songwriter Cass McCombs.

"The Jerry magic is still there," said producer Justin Kreutzmann, 43-year-old son of Grateful Dead drummer Bill Kreutzmann. "All these cool people wanted to be involved, but not by reaching for the hanky and talking about the old days. Everything with Jerry was about humor and great music, so we're trying to do this in a way that would make him chuckle."

The show starts at 6:30 p.m. Aug. 3 at www.tristudios.com. It will also be streamed live at www.yahoo.com. A San Francisco native, Garcia died of a heart attack in 1995 at age 53.