This newly approved route is the only 600K in the US to go into 5 states. It is basically the first 300K and last 250K of the New York–Montreal–New York 1200K route debuting in 2022, with a 50K connector between the two.
The full Randonneurs USA Rules for Riders may be found here.
Event details and schedule
August 28, 3:00am-4:00am : Bike Inspection and Check-In
August 28, 4:00am : DEPART
August 29, 8pm : Cut-off for a successful finish