Been to it previously, rather disappointing tbh. The only good part if you are into riding in groups is the ride. Much easier just to send them a donation.
Just a update I did this, Great day for looking at bikes and chatting to other owners, Ride out a little disappointing out on the road it was a bit of a free for all being under taken and over taken at the same time ! luckily we were very close too the front (early bird) and didn't get caught in some of the ques at either end, We had had a sandwich and a cup of char walked round and people were still queing too get in. Yes we would do it again.