Personally, I'd just stick with corn, if even that. Go with what they're most likely used to eating. On that short a hunt you won't have time to change their diet, but anything weird they're not used to could easily change their pattern for a day. Congrats! Good luck and be safe!
+1 on the corn especially if the hunt manager has been putting out corn. I would add some sent wicks to your bag of tricks. If it is a hunt where you can take a buck then use doe in heat. I had success last year at a WMA where a buck could be taken. The last morning a nice 10 pt came in with his nose high in the air and walked up very near to where I had the sent wick hanging before I shot him. If you can't take a buck then just use regular doe sent. I do think it helps to bring the does in and at least keep them in the area.