I know this isn't a mtb race, and for full disclosure the RD is a friend, but coming up on the 15th is the Northwoods Gravel Grind. Something to mix it up, different than mountain biking.....good endurance event to add some variety and cross-training. This is in Rangeley, Maine can't beat that area in September. It's a legit test......check it out: https://www.bikereg.com/northwoods-gravel-grind