Um... York...
20th and 21st June, Knavesmire Racecourse.
http://www.ctc.org.uk/desktopdefault.aspx?tabid=4377
Various trade stands (inc Velo Vision magazine, drop by and say hello, I'm likely to be there or thereabouts all weekend), some bargains to be had, cycle jumble, various socialising, some grass track racing, and the grand British spectacle that is the old guard CTC, complete with beards, trousers tucked into socks, and more Caradice saddlebags that you can shake a stick at.... Also, Sunday morning, the mass ride from the Minster to the racecourse - hundreds of cyclists, police escort, cars just have to wait....
Seriously, worth a day trip if you're not so far away. Something like £2.50 to get into the trade area, other stuff free.