Upcoming: June 14, 2022 - World Blood Donor Day
"World Blood Donor Day (WBDD) is held on June 14 each year. The event was organised for the first time in 2005, by a joint initiative of the World Health Organization, the International Federation of Red Cross and Red Crescent Societies to raise awareness of the need for safe blood and blood products, and to thank blood donors for their voluntary, life-saving gifts of blood."
https://en.wikipedia.org/wiki/World_Blood_Donor_Day
https://www.who.int/campaigns/world-blood-donor-day