05 May Custom Postage
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- 01 Lei Day
- 01 May Day
- 01 Mother Goose Day
- 01 Save the Rhino Day
- 02 Sibling Appreciation Day
- 03 Tuba Day
- 04 Lobster Race and Oyster Parade
- 04 Scrapbook Day
- 05 Children's Day, Kodomono-hi (Japan)
- 05 Cinco de Mayo
- 05 Family Week
- 05 Midwives Day
- 05 National Pet Week
- 05 Postcard Week
- 05 Teacher Appreciation Week
- 05 Tourism Week
- 05 Un-Mother's Day
- 05 Wildflower Week
- 06 No Diet Day
- 06 Nurses' Day & Week
- 07 Teacher Day, Nat.
- 08 No Socks Day
- 09 Ascension Day
- 09 Receptionist Day
- 10 Childcare Providers Day
- 11 Birth Mothers Day
- 11 Eat What You Want Day
- 12 Chronic Fatigue Day
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- 01 Lei Day
- 01 May Day
- 01 Mother Goose Day
- 01 Save the Rhino Day
- 02 Sibling Appreciation Day
- 03 Tuba Day
- 04 Lobster Race and Oyster Parade
- 04 Scrapbook Day
- 05 Children's Day, Kodomono-hi (Japan)
- 05 Cinco de Mayo
- 05 Family Week
- 05 Midwives Day
- 05 National Pet Week
- 05 Postcard Week
- 05 Teacher Appreciation Week
- 05 Tourism Week
- 05 Un-Mother's Day
- 05 Wildflower Week
- 06 No Diet Day
- 06 Nurses' Day & Week
- 07 Teacher Day, Nat.
- 08 No Socks Day
- 09 Ascension Day
- 09 Receptionist Day
- 10 Childcare Providers Day
- 11 Birth Mothers Day
- 11 Eat What You Want Day
- 12 Chronic Fatigue Day
- 12 Migratory Bird Day
- 12 National Police Week
- 15 Hug Your Cat Day
- 18 Armed Forces Day
- 18 Int'l. Museum Day
- 18 Pickle Week
- 19 Emergency Medical Services Week
- 19 Good Neighbor Day
- 19 Pentecost
- 20 Victoria Day
- 21 Waitstaff Day
- 23 Declaration of the Bab
- 23 Mesmerism Day
- 23 World Turtle Day
- 25 Jazz Day
- 26 Trinity
- 27 Memorial Day
- 31 No Tobacco Day, World
- Barbecue Month
- Bike Month
- Month of Mary
- Older American's Month
- Skin Cancer Awareness Month
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