Tickets for Reading Penn.
 

I will be heading down to Reading Penn. for the Toyo tires Natl. event with my son. (he has never been to a big nat'l event before). Its been 8 years since my last big nat'l event (Indy Nats '99). Is it feasible to show up Saturday afternoon and still be able to purchase tickets for Sunday ? Should we be purchasing them ahead of time ? My only concern is the weather , we are driving from Ontario Canada about 6 1/2 hours and staying in King Of Prussia , so wife can shop all weekend !!!