Bob Marley is the subject of “Marley,” a documentary that opens at E Street Cinema on April 20. (Magnolia Pictures.)

A new Bob Marley documentary, “ Marley ,” opens at E Street Cinema. Critic David Malitz gives it three-and-a-half stars, and you can read the review in tomorrow’s Weekend section.

Speaking of E Street, the downtown theater screens “ The Big Lebowski ” as the midnight movie on Friday.

Easy Rider ,” famous for the scenes showing Jack Nicholson, Peter Fonda and Dennis Hopper smoking actual marijuana around a campfire, plays at AFI in Silver Spring.

The Black Squirrel is among the bars tapping Waldo’s Special Ale, the Lagunitas double IPA named for the Waldos, who are credited with creating the term “420” in the early 1970s. (Other D.C. and Virginia bars who will get a rare keg include the Big Hunt, American Ice Company, Tuskie’s, Westover Market and Lyon Hall; there’s a full list on the local Lagunitas rep’s Twitter account.)

As always on April 20, the Squirrel plans to sell bottles of 420 Extra Pale Ale, an award-winning brew from Atlanta’s Sweetwater Brewing Company. (The name refers to a never-built interstate that was supposed to cut through Atlanta.)

Friday’s Bad Brains concert at the Howard Theatre is sold out, which could have been a real bummer, but the Howard came through and added a Saturday night show, and tickets are still available for that.

Either of these restaurants would make a great dinner date. How about Ripple or the neighboring Sugar Magnolia ? Both are named after songs on the Grateful Dead’s “American Beauty” album.

And finally, because it might come in handy after all this activity, our guide to late-night eats . Or you could just head straight to Muncheez Mania.