Cannabis Calendar · March 2026
Cannabis events & dates — March 2026
Everything on the cannabis calendar for March 2026: conferences and trade shows, retail sales days, policy and voting dates, and regulatory and tax deadlines. Click any item for details and add-to-calendar links, or switch to the week and day views.
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KeyEventSalesPolicyRegulatoryTaxCultureDashed outline = date estimated or pending; confirm with the organizer before booking.
All items in March 2026
1 item- Mar 16, 2026
Federal return due — partnerships & S-corps (Form 1065 / 1120-S)
Calendar-year partnerships and S corporations file (or extend); 280E disallowance flows through to owners' K-1s.
Missing an event in March 2026?
Organizers are listed free. Send us the dates and the source and we’ll add it after checking.