Childcare Needed

We are attending a wedding but it's a no kids wedding. My two boys who are six and two are staying back at our hotel that's just a few minutes away. The wedding itself is from 6 to 11:30 but I was requesting 5 to midnight just to be on the safe side. My older son is usually asleep by 8 o'clock the latest but if he's excited, he might stay up a little later. The little one is more of a night owl and I expect that he usually would fall asleep by 9:30 p.m. but again given a new environment he might be up slightly later.