Helping with local car show. Looking for advice/ideas

My family puts one on every year. All proceeds go to the American Cancer Society. We have a chines auction. We put in each goodie bag a ticket, then out through the day they draw tickets for a give away. Things like hats, coffee mugs, soda, auto cleaning supplies what ever someone wants to donate. We always have an auction for the women out there. We do trophies. 1st, 2nd & 3rd places for each class. We have 14 different classes. We do dash plaques. We also sell our own t-shirts.