#the parents rotate having the children in two-week blocks, depending on the children's ability to be away from each parent for so long,

#the parents split the first and second halves of July and August, with one parent getting the first halves in one year and the second halves the following year, again depending on the children's ability to be away from each parent for so long,

#the parents could just keep following the same week-to-week schedule that would normally apply, without adjusting that schedule for the holiday.