You didn't look far enough:

A Permanent is like a brevet but you can ride it any time, not just on one specific date. Like brevets, routes can start and finish in the same location, but they can also run point-to-point, and can be any distance of 200km+ (100-199km for a Permanent Populaire). Permanents are open to any RUSA member. They can be ridden alone or with a group.

short 'n slow snap