Print off instructions for changing a flat and carry them with you. It sounds silly but before I was proficient at changing my flats that's what I did.

The terrain on the Hope ride is fairly flat. Because the ride is in 25 mi loops you can decide at the sag stop if you want to continue on.

The last time I did it I rode the century. That was an epic week for me, I had just finished the week of the TRIRI tour, approx 300 miles, then rode the Century on the Hope ride.