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The Leaf Register
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Cannabis Calendar · September 2027

Cannabis events & dates — September 2027

Everything on the cannabis calendar for September 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.

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September 2027

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

                                                                All items in September 2027

                                                                2 items
                                                                1. Sep 3, 2027

                                                                  Friday before Labor Day

                                                                  Retail sales dates

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

                                                                  Add to calendar
                                                                2. Sep 15, 2027

                                                                  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

                                                                Missing an event in September 2027?

                                                                Organizers are listed free. Send us the dates and the source and we’ll add it after checking.

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