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Cannabis Calendar · September 2026

Cannabis events & dates — September 2026

Everything on the cannabis calendar for September 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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September 2026

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                                                    KeyEventSalesPolicyRegulatoryTaxCultureDashed outline = date estimated or pending; confirm with the organizer before booking.

                                                    All items in September 2026

                                                    7 items
                                                    1. Sep 4, 2026

                                                      Friday before Labor Day

                                                      Retail sales dates

                                                      End-of-summer holiday weekend; the Friday is the sales spike.

                                                      Add to calendar
                                                    2. Sep 5, 2026

                                                      High Times Cannabis Cup — Montana

                                                      Awareness & cultureBillings, MTThe Pub Station

                                                      High Times' Montana Cannabis Cup awards event in Billings. Date confirmed on cannabiscup.com (a Massachusetts cup is listed with date TBA).

                                                      Organizer: High Times Cannabis CupHigh Times Cannabis Cup ↗Add to calendar
                                                    3. Sep 15, 2026

                                                      Extended federal return due — partnerships & S-corps; Q3 estimates

                                                      Tax deadlines

                                                      Extended 1065 / 1120-S returns are due; third-quarter estimated tax payment due.

                                                      IRS — filing deadlines ↗Add to calendar
                                                    4. Sep 15–16, 2026

                                                      Flower Expo Illinois

                                                      Industry eventsChicago, ILThe Geraghty

                                                      Illinois B2B cannabis trade show connecting brands with retailers, at The Geraghty in Chicago. Dates confirmed on the organizer's site.

                                                      Organizer: The Flower ExpoFlower Expo — Illinois ↗Add to calendar
                                                    5. Sep 18–19, 2026

                                                      37th Annual Boston Freedom Rally

                                                      Awareness & cultureBoston, MA

                                                      37th annual Boston Freedom Rally, MassCann/NORML's two-day cannabis-reform rally. Dates confirmed on masscann.org; the rally is traditionally held on Boston Common.

                                                      Organizer: Boston Freedom RallyThe Boston Freedom Rally ↗Add to calendar
                                                    6. Sep 18–19, 2026

                                                      NECANN New Jersey Cannabis Convention + NECANN Cup

                                                      Industry eventsAtlantic City, NJAtlantic City Convention Center

                                                      NECANN's New Jersey convention — exhibitors, education and networking for the Garden State market, alongside the NECANN Cup competition.

                                                      Organizer: NECANNNECANN — New Jersey ↗Add to calendar
                                                    7. Sep 23–24, 2026

                                                      Ohio Cannabis Health & Business Summit

                                                      Industry eventsColumbus, OHGreater Columbus Convention Center

                                                      State-focused summit for Ohio's medical and adult-use market at the Greater Columbus Convention Center. Dates confirmed on the organizer's site (the 'Oct 3 Cleveland' listing elsewhere is a stale 2023 page).

                                                      Ohio Cannabis Health & Business Summit ↗Add to calendar

                                                    Missing an event in September 2026?

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