How about classic and sports car gathering AND BEER FESTIVAL -Brill, Bucks. TVR's will be there. visit brillbeerfestival.co.uk for a flavour of the event. Its free, It's come and go as you please and you will be made very welcome.
I was thinking more of a long drive out to say Wales or something. Classic car shows are not really my thing.
Are you driving over to Oulton on the Wednesday for the Track day? Alternatively you could go to Oulton on the Sunday or Monday before for the Gold Cup?