No, you don't have to be there for all four days. As a matter of fact, we purposely broke out the days to have the car show guys in and out on the weekend, and the die hard track guys on MOn/Tues, so they could make better use of the time with their preferred events.
When you register, you get the Defensive Driving course included (that's Sunday) and it is required for the other track events. Check out and download the registration packet off of the site, and pick n' choose what you want to participate in.
There's a great Banquet planned for Sunday night. Check the site for all of the details. MBCA's Mid-America Caravan HOME
You will have to become a MBCA member to participate (for our insurance), but I can get you hooked up, if you're not already a member.