MAY 2021
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| 1 | Feast of St. Joseph the Worker |
 | International Workers' Day |
 | Beginning of the Catholic Worker Movement |
| 2 | National Day of Prayer |
| 3 | Feasts of Sts. Philip and James |
 | Teacher Appreciation Week |
| 4 | Anniversary of the Kent State Massacre (1970) |
 | First Freedom Ride |
| 5 | Cinco de Mayo |
 | National Day of Awareness for Missing and Murdered Native Women and Girls |
| 8 | World Red Cross and Red Crescent Day |
| 9 | Mother's Day |
| 13 | Feast of the Ascension of the Lord (Ascension Thursday moved to Sunday) |
| 16 | Feast of the Ascension |
| 20 | Birthday of Franz Jägerstätter (1970-1943): He was executed for his refusal to fight for Hitler. |
| 21 | World Day for Cultural diversity for Dialogue and Development Birthday of |
| 22 | International Day for Biological Diversity |
 | Birthday of Betty Williams—A co-recipient with Mairead Corrigan Maguire of the Nobel Peace Prize in 1976 for her work as a co-founder of the Community of Peace People, an organization dedicated to promoting a peaceful resolution to the troubles in Northern Ireland. |
| 23 | Feast of Pentecost (Pentecost Sunday) |
| 24 | Day of prayer for the Catholic Church in China |
| 25 | Africa Day |
| 30 | Feast of the most Holy Trinity (Trinity Sunday) |
 | Feast of St. Joan of Arc |
| 31 | Feast of the Visitation of Mary |
 | Memorial Day |
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