April 20 Grateful Dead Movie Event Marcus Midtown, 3201 Farnam St. Village Pointe Cinema, 304 N. 174th St. 7:30 p.m., $12.50 marcustheatres.com/Movie/MovieDetail/63744 There may be no better way to spend a fine 4-20 than by taking a cinematic flashback with the Grateful Dead. This nationwide, one-night-only event is like an onscreen trip, if you will, to a Dead concert. The Grateful Dead Movie has been unavailable theatrically since its release in 1977, but tonight you can take it all in, including exclusive, previously unseen interviews with Jerry Garcia and Bob Weir that were filmed more than 35 years ago. Remember, this deadhead must-see is being offered for only one night before it’ll be truckin’ on.