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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 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
                                              3. Sep 15–16, 2026

                                                Flower Expo Illinois

                                                Industry eventsChicago, ILest.

                                                Illinois cultivation-and-brand focused expo. Dates from a third-party conference roundup — confirm with the organizer before travelling.

                                                Grasslands — 2026 conference roundup ↗Add to calendar
                                              4. Sep 17–18, 2026

                                                Benzinga Cannabis Capital Conference — Chicago

                                                Industry eventsChicago, ILest.

                                                Investor-facing cannabis conference. Third-party listings conflict on the 2026 edition (a June Chicago edition under the IgniteIt banner vs. September 17–18) — treat these dates as unconfirmed until the organizer publishes them.

                                                Organizer: Benzinga Cannabis Capital ConferenceBenzinga events ↗Add to calendar
                                              5. 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
                                              6. Sep 23–24, 2026

                                                Ohio Cannabis Health & Business Summit

                                                Industry eventsColumbus, OHest.

                                                State-focused summit for Ohio's medical and adult-use market. Third-party sources disagree on dates and city (Sept 23–24 Columbus vs. Oct 3 Cleveland) — verify with the organizer.

                                                Grasslands — 2026 conference roundup ↗Add to calendar
                                              7. Sep 25–26, 2026

                                                NECANN Rhode Island Cannabis Convention

                                                Industry eventsProvidence, RIRhode Island Convention Centerest.

                                                NECANN's Rhode Island edition. The 2026 dates come from third-party guides; NECANN's own page currently lists only the October 15–16, 2027 edition.

                                                Organizer: NECANNNECANN — Rhode Island ↗Add to calendar

                                              Missing an event in September 2026?

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