This Thursday, on 4/20, theaters nationwide will screen The Grateful Dead Movie for its 40th anniversary. At over five hundred movie theaters across the country, at 7 p.m. local time, this classic movie and tribute to the Grateful Dead will screen along with some additional exclusives for these special screenings. In addition to The Grateful Dead Movie, theaters will preview Long Strange Trip, the highly anticipated film by Amir Bar-Lev and produced by Martin Scorsese that will be released to the general public via Amazon streaming services later in the year, along with a new mini-documentary about the Grateful Dead’s legendary performance at Cornell University on May 8th, 1977.In anticipation of these screenings, the folks over at Relix just premiered a preview of the May 8, 1977 Cornell University mini-documentary. You can check out the teaser for yourself below, which features a bunch of interviews with Heads who were in attendance to see that iconic “Morning Dew” go down. Check it out for yourself below, and grab tickets for the movie when it hits theaters this Thursday here.