Pop Warner will be there from 12/4 to 12/12. Some people will give you "official dates" i.e. when they are supposed to be there according to the website and performance schedules, but just figure you will start seeing them on property beginning on Friday, 12/4 thru Saturday, 12/12.
Remember, they will also rent out DHS one of those nights for their private party. I cannot say for sure when that is, though it may be Friday, 12/11 beginning at 6-7:00 pm.