May 1977 Holidays
| Holidays May, 1977 | Week Day | Date |
| Cinco de Mayo | Thursday | May 5, 1977 |
| Mother's Day | Sunday | May 8, 1977 |
| National Maritime Day | Sunday | May 22, 1977 |
| National Missing Children's Day | Wednesday | May 25, 1977 |
| Memorial Day | Monday | May 30, 1977 |
| Holidays May, 1977 | Week Day | Date |
| Cinco de Mayo | Thursday | May 5, 1977 |
| Mother's Day | Sunday | May 8, 1977 |
| National Maritime Day | Sunday | May 22, 1977 |
| National Missing Children's Day | Wednesday | May 25, 1977 |
| Memorial Day | Monday | May 30, 1977 |