In honor of U.S. Independence Day, everyone has the option of going to Main Street, U.S.A. tomorrow! You can read books from any of the Main Street Squares!
This is a totally free move! You don't need to have finished your prior square to move, and this doesn't disrupt your rolling schedule (in other words, if you're free to roll on the 5th, you can still roll on the 5th even though you moved on the 4th). But, if you do move, that's your new starting spot for your next roll! If you don't take the offer, you don't get the extra move!