To do this, I circled all the dates on the attached calendar, with red = middle and blue = high. The 6th of March in 2018 is when both schools will have chicken wraps again.
We need to find the lowest common multiple of 6 and 8...and that number would be 24. So 24 days from March 5 is when they will both happen again. So thats gonna make it March 29.