This can be a handy tool to find them http://www.classicshowsuk.co.uk/classic-car-shows-events-search/major-classic-car-show-events.asp not every type of show is there but seems easier than google to find some thing to do.
If you find one you intend to go to why not post it up in the the main event forum and see if others want to join you.
If you find one you intend to go to why not post it up in the the main event forum and see if others want to join you.