Excluding Holidays from discounts.

I have a trigger for stays 7 or more nights receive 15% off. How would I set a parameter that if if a guest goes to book 7 or more nights and one of the days they are booking is labeled as a holiday the 15% of won’t populate?

Can anyone help me please?

By trigger, you mean you have a discount created. There is no way add "not for holidays" on the criteria. However, you could target it to seasons. So if you create a season for each holiday (using the "specific date" type of season) then you could set the 15% discount to be "everything but" and then select those seasons.

By the way, instead of doing a 7 day discount, you could also set up a "Weekly" rate type instead that lowers the price to what you want for a week.