www.hmhco.com/blog/happy-national-teacher-appreciation-week-ideas
www.waterford.org/resources/teacher-appreciation-week-ideas/
www.nationaldaycalendar.com/national-teacher-appreciation-day-tuesday-of-the-first-full-week-in-may/
www.usatoday.com/story/news/education/2021/05/03/what-know-teacher-appreciation-week-and-national-teacher-day/4924803001/
https://en.wikipedia.org/wiki/List_of_Teachers'_Days