"Can we come down on Tuesday?"
"Well, Mom, actually, Tuesday is our first day of school, and Monday we're having new windows put in, so all our furniture is pushed to the center of the floor, so we're pretty busy."
"Yes, well, what time Tuesday would be good?"
"Well, actually, we're starting school Tuesday, so we're pretty busy."
"Well, you take a lunch break, don't you?"
"Yes, but, you know, we're really busy this week."
"We'll be there around lunch time. We'll bring lunch."
Long story short, it's a good thing I only planned a short day of school, because my parents and my sister were here from noon to 4.