National Bird Day, May 4. An annual holiday with half a million adherents who celebrate through birdwatching, studying birds, and other bird-related activities. 

Mother’s Day, May 10. Honor the mother or mother figure in your life.

National Senior Health & Fitness Day, May 27. The common goal for this day is to help keep older Americans healthy and fit.

Memorial Day, May 25. A federal holiday in the United States for honoring and mourning the military personnel who died while serving in the United States Armed Forces.