Yes there is a very large area for vendors, as well as large and small swap meet spaces. You can even get a 1/4 mile run of your "show car" on Friday. I may do that this next year. I put my in display class in 2017 and got it judged in 2018. Disply only planned for 2019.
Welcome and Congrats - I had a 67 Signet Gold LeMans back in the day. Yours looks very nice. Please try to get it in good running condition and bring it to the Pontiac Nationals held each early August in Norwalk OH. You mentioned Columbus - There is also an annual show in Springfield in the early spring. I live near Toledo and am looking forward to that one already.