You don't need a schedule. Sunday will suck. Most guys are packing up Saturday night to leave. If those two days are the only options the Saturday is the day to go.
Joe I'm not sure if they are doing it for all events this year or not but for spring carlise they had a special sunday swap meet. the 'junk in your trunk' swap meet. It was reserved for people that didn't normally want to setup and sell.
I think it was $25 at the gate and then you just pull in and find a spot to sell. If they are doing that for all events then Sunday could become worth staying for.