The 420 Collaboration is an annual campaign to create and improve cannabis-related content at Wikipedia and other Wikimedia projects in a variety of fields, including culture, health, hemp, history, medicine, politics and religion.

The campaign usually runs starting late March through April, and is organized around curated lists of redlinks or at-will article creation and improvement on English Wikipedia (or media contributions to Wikimedia Commons).

• ---Another Believer _(Talk) 17:44, 4 February 2025 (UTC)[reply]
• //Lollipoplollipoplollipop::talk 17:45, 4 February 2025 (UTC)[reply]
• ☆ Bri (talk)

• Expand Cannabis in Germany, especially from German article. One year on from legalisation, lots of new info to add.
• Expand Cannabis legislation proposals in the United States
• populate Category:2024 in cannabis
• create and populate Category:2025 in cannabis
• recategorization? follow up on Talk:Cannabis industry
• complete Outline of cannabis hemp, e.g. Hemp in North Carolina
• Deorphan
  • Amercanex
  • American Autoflower Cup
  • Aurora Sky and Aurora Sun
  • Cannabis trafficking penalties for juveniles
  • Keyva King
  • Kush Bottles
  • Panaxia
  • Sticky Fingers Brownies
  • Tokken
• Redlinks
• Switzerland legalization

• Sara Carter (journalist)
• The Marijuana Show
• Weed Rules

• Cannabis advertising
• Chris Visco
• Copperstate Farms
• Degenerate Art (film)
• Fallo Arriola
• The Grass Company
• Green fairy (cannabis)
• MardiGrass
• National Cannabis Industry Association
• Operation Pipe Dreams

• Chris Visco
• Copperstate Farms
• Fallo Arriola
• Four Twenty Bank
• The Grass Company
• Lakeside Herbal Solutions
• Lee Carroll Brooker case
• Tweed Farms

• File:Copperstate Farms logo.png
• File:Degenerate Art documentary film cover.jpg
• File:MardiGrass logo.png
• File:The Grass Company logo.png
• File:Tweed Farms logo.png
• File:Weed Rules cover.jpg

• 
  Sign for Brothers, billed as "Oregon's oldest dispensary", Portland, Oregon
• 
  Cannabis Corner, Portland, Oregon
• 
  Cannabis Corner
• 
  Cannabis Corner
• 
  Cannabis Corner

• Wikipedia:WikiProject Cannabis/420 Collaboration/2017
• Wikipedia:WikiProject Cannabis/420 Collaboration/2018
• Wikipedia:WikiProject Cannabis/420 Collaboration/2019
• Wikipedia:WikiProject Cannabis/420 Collaboration/2020
• Wikipedia:WikiProject Cannabis/420 Collaboration/2021
• Wikipedia:WikiProject Cannabis/420 Collaboration/2022
• Wikipedia:WikiProject Cannabis/420 Collaboration/2023
• Wikipedia:WikiProject Cannabis/420 Collaboration/2024