Teacher Appreciation Week is quite common in the schools where I live, especially in preschool & elementary.
Most of the time, the PTA or a group of parents (if there isn’t a PTA) organizes the week, & having a theme for each day is pretty popular.
As both a former teacher & a parent & Facebook friends w/ several teachers & participating parents, over the years, I’ve seen the following themes:
Flower Day
Favorite Snack Day
School Supply Day
Favorite Beverage Day
Note of Appreciation Day
Chick-Fil-A Day
Breakfast Day
Potluck Lunch Day
Most of the time, the week is arranged so that Monday through Thursday are relatively “easy” and/or inexpensive themes - flower day (every child brings one flower to make up a bouquet for the teacher), snack or beverage day, school supply day, note of appreciation day, etc. - & culminates w/ a bigger “finale” on Friday - Chick-Fil-A for lunch, a catered breakfast or lunch, potluck lunch, etc.