Our twins had just started kindergarten and had only went to school for one day when we went last September for free dining. We are doing it again this year (bounceback). When we went for open house at the school we let the teachers know and then filled out a form that said what days they would be absent. We received the form back and the teachers had written what homework had to be done on it (for my older ones). I'm glad we did it and will keep doing it as long as free dining is offered. It saves soooo much money for six people.
Your kids went to K for one day. Then you went to Disney for a week, and then they went back to school?? Did they adjust ok?? I think my son will be fine. He just goes with the flow. He is smart, and I will work with him while we are gone. I keep thinking it is probably better to pull him out the first few weeks of school rather than later in the year. In the beginning, they will just be reviewing things!!

His mom handled it very well but was very surprised since he was not normally like that. I wouldn't worry so much about what work they would miss on the K level, I think Kindergarteners are working more on establishing routine and getting to know each other as a class the first week or so.
Sometimes, you just never know!
He was fine!