Cannabis events & dates — April 2027
Everything on the cannabis calendar for April 2027: 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.
KeyEventSalesPolicyRegulatoryTaxCultureDashed outline = date estimated or pending; confirm with the organizer before booking.
All items in April 2027
10 items- Mar 31 – Apr 1, 2027
Flower Expo — Brooklyn, New York
Flower Expo's New York B2B show connecting cannabis brands with licensed retail buyers, 10 a.m.–5 p.m. both days at 99 Scott Studio, Brooklyn.
- Apr 1–30, 2027
National Cannabis Awareness Month
April is observed by advocates and brands as cannabis awareness month, culminating on 4/20. Useful anchor for education campaigns and community events.
- Apr 3, 2027
Hash Bash 2027
Annual free cannabis rally on the University of Michigan Diag. hash-bash.org states the rally is held the first Saturday of April each year; the 2027 date is projected from that pattern and not yet announced.
- Apr 9–10, 2027
NECANN Boston — New England Cannabis Convention
NECANN's flagship New England convention at the Hynes Convention Center, Boston. April 9–10, 2027 (Fri 10–5, Sat 10–4), confirmed on necann.com.
- Apr 13–15, 2027
International Cannabis Business Conference — Berlin
Europe's longest-running international cannabis B2B conference and trade show.
- Apr 15, 2027
Federal return due — C-corps & individuals (Form 1120 / 1040)
Calendar-year C corporations and individuals file (or extend) and pay. Q1 estimated tax is also due. If April 15 falls on a weekend or DC's Emancipation Day, the IRS moves it — confirm each year.
- Apr 16–20, 2027
4/20 promo window
The run-up to 4/20 — retailers spread promotions across the weekend before, and Canadian stores often peak on the Friday. Menu screens, online menus and loyalty campaigns should be scheduled for the whole window.
- Apr 20, 2027
4/20 — the biggest cannabis retail day of the year
The single largest sales day for licensed cannabis retail. Plan inventory, staffing, menu boards and promotions weeks ahead; most stores discount, and transaction counts — not just basket size — spike.
- Apr 20, 2027
Mile High 420 Festival
Denver's free 4/20 celebration at Civic Center Park, held every April 20 (a Tuesday in 2027). Not yet confirmed: Civic Center Park's 'Next 100' renovation keeps parts of the park closed into 2027, and Denver Parks & Recreation said in April 2026 that the status of the next festival 'has not yet been decided'.
- Apr 30, 2027
California cannabis excise tax return due — Q1 (Jan–Mar)
Cannabis retailers file the CDTFA cannabis retailer excise tax return and payment for Q1 (Jan–Mar). The excise rate is 15% through June 30, 2028 (AB 564).
Missing an event in April 2027?
Organizers are listed free. Send us the dates and the source and we’ll add it after checking.