- September 2025:
- October 2025:
- 1: Crystal Mountain – Crystal Spa Days – October 1 – November 16, 2025
- 2: Mackinac Island Fudge Festival – October 2 – 4, 2025
- 3: Grand Hotel – Somewhere in Time Weekend – October 3 – 5, 2025
- 5: Mackinac Island Wedding Show – Mission Point Resort – October 5, 2025
- 10: Grand Hotel – Cork & Fork: A Celebration of Female Culinary Talent – October 10 -12, 2025
- 12: Legacy Five at Grand Hotel – October 12 – 14, 2025
- 17: Grand Hotel History Weekend – October 17 – 19, 2025
- 18: Crystal Mountain – 19th Annual Peak2Peak Mountain Bike Classic – October 18, 2025
- 24: Grand Hotel – Fall Murder Mystery Weekend – October 24 – 26, 2025
- 25: Mackinac Island Great Turtle Trail Run – October 25, 2025
- 26: Grand Hotel – Close the Grand for the Season – October 26 – 27, 2025
