I hope to do a 600km ride this year, and have entered one in mid May, but will actually be on holiday when it is on. I have some reservations about riding that kind of distance in the UK anyway as I'm somewhat traffic averse at the best of times and I only get less tolerant of it as I get more tired. Consequently, I am wondering about riding a 600 in The Netherlands, although probably as a DIY. Do randonneurs.nl have anything like the UK permanent rides that I could enter to get a preplanned route? I see that there is a 600 from Amsterdam in early June, but I won't be able to ride it, and I don't see any other scheduled events of that distance that I will be likely to ride.