How many weeks to go until the ride?
I would suggest trying to get a ride more in the 75-80 mile range in before the event. Also, work as many long back-to-back rides into it as you can. Don't worry about climbing fast. Rather, climb smart. Pace yourself and spin in a comfortable gear if you can (rather than power over the climbs). Eat and drink enough. Stay relaxed on the bike. Take a moment to stretch at rest stops. Use chamois cream liberally.
I've done some week-long and multiday tours. After each day, my legs would feel like poo for the first 7-10 miles. Then they get warmed up and start moving again. For me, the key is to stay on top of nutrition and hydration in between and during the rides. Once you're dehydrated, it is really hard to get out of that hole.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher