Twenty things to do on 4/20 -- happy holiday!

​It's April 20: Do you know where your headies are? Because nothing goes with everyone's favorite (legal!) medicine like listening to righteous tunes, here's a rundown of where you can go to get your musical fix tonight -- trichromes not included.

Special 4/20-centric events:

Once the haze has lifted from Civic Center Park, after-parties for the 4/20 rally will begin to shape up at Casselman's and Quixote's True Blue.

The doors at Casselman's open at 9 p.m., and performers include Paul Wall, 20:12, D A Dub, Hypnautic, King Tef & Johny Rochetz; there will also be a fashion show hosted by DJ Cyn. ($20-$25)

Quixote's hosts Whiskey Tango, Stoney Holiday, Buntron Smith and Oaksmere Piddie at Skunk Entertainment's after-party, which starts at 4:20 p.m. (free with flier, $5 without)

BurlyCute will reprise its Reefer Mania burlesque extravaganza at Bender's Tavern, featuring 1920s- and '30s-era songs about smokin' dope; the 8 p.m. show will be followed by a release party for madame Cora Vette's album of Reefer Mania songs, titled Smokin' Reefers. (21+, $12)

Kush magazine's 4:20 Bash lands on Herman's Hideaway, 1578 South Broadway, and will feature J.O.B. with Prime Element and Jus Cos. (21+, $5)

The Whomp Truck doesn't always whomp on Wednesday, but you can catch the guerrilla dubstep team at the Sacred Plants Visionary Art Show + Wine and Cheese Reception from 5 to 11 p.m.

The Mercury Cafe is hosting an oil spill teach-in at 5:30 p.m., followed by a free open stage for musicians, comics and magicians and a dispensary legal benefit featuring Doo Crowder, Sons of the Addicted, Coyote Poets of the Universe. Both start at 8 p.m. (all ages)