We had parents fighting our school over missed classes for ECs and family travel all the time. The official rule was that you weren’t to miss school for anything other than illness, but we had quite a few kids (this was a k-8 school) on travel hockey teams, ice skating competitions, tennis. One family left early once a week for piano lessons. It is very disruptive. The official rule was that home work was made up after the class was missed, not before, and teachers didn’t have to provide a packet for missed work. Some teachers did, but most did not. Parents didn’t like it. Teachers didn’t like parents complaining. Administration fell back on the rules, and if you didn’t like it you could leave. The tennis player left (his sister became a skier and she missed a lot of school too).
Families did miss school for vacations too. One very prominent family took the entire week off for Thanksgiving every year. No one ever said anything to them and their kids weren’t docked grades.
We had to follow the rules. My kids missed 4 days when we went to China. It was a huge deal to plan and make up the work. We didn’t even miss school for dentist or ortho appointments.