I, personally, think you'll be be fine riding 50 to 70 miles on 5/30 regardless of what you do on 5/23. You've got a whole week to rest your legs, which is more than adequate. If it were me, I would cut out the runs the week before the century, however, and just do a couple of short and easy spins.
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