May 1978 Holidays
| Holidays May, 1978 | Week Day | Date |
| Cinco de Mayo | Friday | May 5, 1978 |
| Mother's Day | Sunday | May 14, 1978 |
| National Maritime Day | Monday | May 22, 1978 |
| National Missing Children's Day | Thursday | May 25, 1978 |
| Memorial Day | Monday | May 29, 1978 |
| Holidays May, 1978 | Week Day | Date |
| Cinco de Mayo | Friday | May 5, 1978 |
| Mother's Day | Sunday | May 14, 1978 |
| National Maritime Day | Monday | May 22, 1978 |
| National Missing Children's Day | Thursday | May 25, 1978 |
| Memorial Day | Monday | May 29, 1978 |