Pi Day

Tau Day

Vidovdan

Vidovdan, celebrating St. Vitus and an important day in Serbian history. (Eastern Orthodox Church)

1956 Poznań protests

Poznań Remembrance Day (Poland)

Constitution Day (Ukraine)

Constitution Day (Ukraine)

June 28 (Eastern Orthodox liturgics)

Christian feast day:
June 28 (Eastern Orthodox liturgics)

Vincenza Gerosa

Christian feast day:
Vincenza Gerosa

Pope Paul I

Christian feast day:
Paulus I

Beatification

Christian feast day:
Blessed Maria Pia Mastena

Heimerad

Christian feast day:
Heimerad

Irenaeus

Christian feast day:
Irenaeus of Lyon (Western Christianity)

Basilides and Potamiana

Christian feast day:
Basilides and Potamiana

Pride Month

International LGBTQ Pride Day, marking the anniversary of Stonewall riots.

Dave Parker

Dave Parker, American baseball player and coach (born 1951)

D. Wayne Lukas

D. Wayne Lukas, American horse trainer (born 1935)

Aminu Dantata

Aminu Dantata, Nigerian businessman and philanthropist (born 1931)