May 7: Bob Weir and the Marin Symphony at the Marin Center

Postponed last year, rescheduled this year—and who knows what the future holds—the Marin Symphony’s collaboration with Grateful Dead guitarist Bob Weir is one of the most anticipated Marin-rock-guy-with-symphony events since Metallica’s S&M. Billed as “First Fusion,” the night ends with an improv jam after a program of Grateful Dead compositions. A rehearsal video of the track “Let It Grow” has made the rounds so far, sounding less like the Boston Pops and more like a rock band (Weir sings). Take bets on the rest of the set list beforehand when the night, a fundraiser for the Marin symphony, gets underway on Saturday, May 7, at the Marin Center. 10 Avenue of the Flags, San Rafael. 8pm. $50–$75.