The blog "Riding Pretty" has a calendar of sorts with lots of posters for the Tweed Rides:
http://ridingpretty.blogspot.com/201...0-revised.html

I have never taken part in these and probably won't in future. It reminds of role play gaming and that whole scene has never appealed to me -be the theme dragons or bicycles. I normally wear a lot of wool and formal clothing on my bike, and I ride vintage bikes. But the point is that it is my normal way of riding a bike, and not a costume I put on along with other enthusiasts.