NHSA Grass Drags and Water Crossing is Oct 8-10.
Check out NHSA.com for details.
I go every year. Lots of manufacturers and vendors too. I do some shopping for gear, check out the new sleds and watch some racing.
I go every year and just got back from them yesterday. It was really good this year, they had some sledneck riders there doing freestyle.... I was disappointed at the low number of polaris and yamaha sleds racing though, I only saw 3 polaris' and 1 yamaha