If you're going to be in/around Northern Utah at the beginning of May (May 5th to be precise), be sure to add The Wild Horse to your to-do list. Takes place about an hour from Salt Lake City on the northern edge of the West Desert. Fast course with lots of different surfaces, from hardpack to marbles to deep sand. Really fast with a couple of major-ish climbs. Seventy-six (76) miles for the long and thirty-two (32) miles for the short version with aid stations along the route. The route circumnavigates the Cedar Mountain Wilderness Area just west of Salt Lake City and is suitable for either mountain bikes or big-tired gravel bikes.
I know the guy who runs this and the area's beautiful so I thought that I would do a little uncompensated promotion. I ride out there a few times every year and haven't yet seen more people than antelope or wild horses. About as bleak and beautiful as it gets. Registration is $75 until April 9th when it jumps by $10.