The Grateful Dead's 1977 concert film, The Grateful Dead Movie, will return to theaters for one night only to celebrate its 40th anniversary this year.

The original film, which runs more than two hours, will be supplemented with a bonus documentary, also from 1977, by Fathom Events and Rhino Entertainment for a screening at 7PM local time on (when else?) April 20.

You can watch a trailer for the movie above.

The movie, shot on 16mm film, was co-directed by Jerry Garcia during a five-night series of shows at San Francisco's Winterland in October 1974 that were completed before the Dead went on hiatus. The band at the time included Garcia, Bob Weir, Phil Lesh, Mickey Hart, Bill Kreutzmann, Donna Godchaux and Keith Godchaux.

The soundtrack includes some of the Grateful Dead's best-loved songs: "Truckin'," "Sugar Magnolia," "Casey Jones" and the epic "Dark Star."

The 1977 feature presentation will be accompanied by a look at the upcoming Grateful Dead documentary Long Strange Trip, as well as a never-before-seen mini-documentary about the band’s show at Cornell University on May 8, 1977.

“Grateful Dead fans across the country share a special connection with each other and with their favorite band.” Fathom Events CEO John Rubey said in a statement announcing the one-night-only screening. “Gathering these dedicated fans together to experience exciting content from their favorite artists is at the core of what we do, and this event is a great example of that.”

You can buy tickets for The Grateful Dead Movie at Fathom's website.

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