Good advice already! To echo what @grwoolf said… I have had some solid performances in the middle of some tough training as well, so don’t be afraid of going into a race a little tired, you might surprise yourself.
That said, I think a 2 day “taper” is always appropriate. I mean it is a race after all and if I am putting all the time and money into doing a race I want to perform well. Personally I prefer an endurance ride two days out then a light “shake-out” with some accelerations the day before (about 30-45 min… 60 at the absolute max). But everyone has their own thing they do. Recently I read the “openers & priming workouts” thread and was amazed at how much volume and intensity some people do before a race. But you gotta do what you feel works for you.
Best of luck to you!