- National Physical Fitness and Sports MonthMay
- National Youth Traffic Safety MonthMay
- Sudoku First Published as Number Place in Dell Puzzle MagazineMay, 1979
- Hurricane Preparedness WeekMay 25-31, 2012
- Cellophane Tape PatentedMay 27, 1930
- Golden Gate Bridge OpenedMay 27, 1937
- Golden Gate Bridge OpensMay 27, 1937
- National Spelling Bee WeekMay 27-Jun 1, 2012
- Sojourner Truth Gives “Ain’t I Woman?” SpeechMay 28-29, 1851
- Memorial DayMay 28, 2012
- John F. Kennedy’s BirthdayMay 29, 1917
- First Daily American Newspaper PublishedMay 30, 1783
- President Woodrow Wilson Proclaims June 14 Flag DayMay 30, 1916
- First US copryight law passedMay 31, 1790
- Walt Whitman’s BirthdayMay 31, 1819
- Mark Felt Reveals Himself as Watergate’s Deep ThroatMay 31, 2005
- Adopt-a-Shelter-Cat MonthJune
- National Rose MonthJune
- Cancer From the Sun MonthJune
- Dairy MonthJune
- National Rivers MonthJune
- National Fireworks Safety MonthJune
- Great Outdoors MonthJune
