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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)

Happen to be happening tonight:

Indie folksters Rural Alberta Advantage will play the hi-dive with Lord Huron and Jay J Matott; doors open at 8 p.m. (18+, $12)

Contemporary jazz legend Lee Ritenour starts his show at the Soiled Dove Underground at 8 p.m. (21+, $30)

At Cervantes', the bass will be heavy with Two Fresh, Lazersword and Mochipet on stage starting at 9 p.m. (all ages, $25)

Punk-rock veterans Unwritten Law headline a show that also includes Authority Zero, Boldtype and No Bueno at Summit Music Hall; doors open at 7 p.m. (all ages, $18)

etown's Earth Day show hits the Boulder Theater at 6 p.m.; guests are Arlo Guthrie and Reed Foehl. (all ages, $27)

The trippy multimedia project the Shpongletron Experience, with Random Rab and Lynx, starts at 9 p.m. at the

Bluebird Theater. (16+, $35)

Ghettotech outfit Floor headlines a show at the Marquis Theater with Adai and the Black Sheep of Kali at 8 p.m. (all ages, $14)

If you're in the mood for some bluegrass, Kentucky Street Parlor Pickers and Mike Gibbons are playing the Laughing Goat starting at 8 p.m. (all ages, free)

The Gothic Theatre plays host at 7 p.m. to indie darlings Scala & Kolacny Brothers, whose cover of Radiohead's "Creep" you might remember from The Social Network. (all ages, $25)

Next door, the stage at Moe's will host reggae/hip-hop group Ghost Town Bandulu, with Green River Vibe and the Knobby Roots A Mac DZ Experience starting at 9 p.m. (16+, $5)

Oskar Blues hosts a Tribute to Dolly Parton from 7 to 11 p.m. (all ages, free)

Weekly happenings:

As Jon Stewart's "enhancement smoker" character in Half-Baked well knew, sometimes things you can do all the time are a whole new experience when you're ON WEED.

This round's Wasted Wednesday at Vinyl features Sleepyhead, Salva, Anansi, Wyatt Lamond and Tree Thugger starting at 9 p.m. (18+, $5)

Gypsy Swing Revue plays its weekly show at the Irish Snug at 8 p.m. (all ages, free)

Keep things dreamy at the Walnut Room's Slowdown Lounge with Paul Riola from 5 to 8 p.m. (21+, free)

Honorable mention:

The sold-out Duran Duran show at the Ogden and Collie Budz at the Fox are bound to be a good time -- if you already bought your tickets.