Fans packed last year's Slightly Stoopid 4/20 show at Red Rocks. For 2014, the band returns to the Morrison amphitheater with a sold-out show on April 19. (Seth A. McConnell, Denver Post file)

UPDATED: 47 ways to party in Colorado on 4/20

The Definitive 4/20 Guide: The Cup, the shows, the parties, the symposiums, the festivals and the pub crawls

6. Big Industry Show: This “business-to-business trade show for the smoke shop industry” will open its doors to the glass-adoring public after a couple days of B2B action. April 16-20 (open to the public April 18-20) at the Denver Mart. $10 on April 18; Cannabis Cup admission required for April 19-20. bigindustryshow.com

7. Ice Cube and Action Bronson: Homestead Hydro Presents Opening Night Party. Ticket price does not include Cup admission. April 18 at the Denver Mart. $60. cannabiscup.com/denver

8. World Cannabis Week: Some of the locals behind My 420 Tours have created the all-encompassing World Cannabis Week to define the many happenings around the state’s 4/20 scene every mid-April. April 16-20 at various venues. my420tours.com

9. Leftover Salmon in the Streets: These Colorado favorites are taking over the streets outside Cervantes Masterpiece Ballroom at 4:20 on 4/20 for a big party. April 20 at Cervantes, 2637 Welton St., Denver. $4.20. cervantesmasterpiece.com

10. Dabroots: Nappy Roots headlines this three-day Strainwise-sponsored bash, and they’re supported by the Malah, Stylust Beats, David Starfire, P-Nuckle, Disco Floyd and others. April 18-20 at Darkstar Lounge, 1630 Federal Blvd. $85 for three-day passes. dabrootsdenver.com

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