Yeah, you'll feel the altitude but just a tiny wee smidge and only when you sprint or climb hills. Since there are no hills except a few minor blips crossing the Logan River, you should have no problemos. Of course, if you feel the need to drop the hammer, the pain is all your own fault.

The MTB trip Yellow, V and I just finished was a bit higher elevation with those afore-mentioned 20 degree inclines on loose dirt and knobby tires, and nobody died, so we all should be just fine on flat pavement.

Unless you arrive several months ahead of time, 3 days will give you the max acclimation you can expect. At only 5,000 ft and flat, it's not really that necessary unless you plan on that sprint.