The evening before Thanksgiving is one of America's biggest bar/nightclub nights of the year as snowbirds, expats, etc. return home for the holiday and want to catch up with friends while in town.
Gasport certainly has its share of Thanksgiving Eve events.
The Canalside Inn's party features Last Call (unplugged) from 9 until midnight. The event page is: https://www.facebook.com/events/2540613929364346/
Chop Shop Bar and Grill features DJ One Ten from 10:00 PM until 1:00 AM. The event page is: https://www.facebook.com/events/532708667295109/
Becker Farms and Vizcarra Vineyards has a shindig from 6 until midnight with live music from Dave Stockton, drink specials, and food specials. The Facebook page is here: https://www.facebook.com/events/621556582000543/