I charge per spot not days attended. There are many professions (and shifts) that might not need mon-fri full time care but if you sign on with me, that's what you're paying for.

However, I do have a holiday fee that I charge if I know ahead of time that they won't be here. I would charge them that all summer. I'm looking at filling two spots this Fall and am revising my contract. Right now I charge $10/less per day as the holiday fee but am considering having a cap on that and anything after that will go down to only $5/day off