Trianon Treaty Day

Trianon Treaty Day (Romania)

Public holidays in Hungary

National Unity Day (Hungary)

International Day of Innocent Children Victims of Aggression

International Day of Innocent Children Victims of Aggression (International)

Flag Day of the Finnish Defence Forces

The Flag Day of the Finnish Defence Forces, also known as the birthday of C. G. E. Mannerheim, Marshal of Finland (Finland)

June 4 (Eastern Orthodox liturgics)

Christian feast day:
June 4 (Eastern Orthodox liturgics)

Saturnina

Christian feast day:
Saturnina

Quirinus of Sescia

Christian feast day:
Quirinus of Sescia

Saint Petroc

Christian feast day:
Petroc of Cornwall

Optatus

Christian feast day:
Optatus

Francis Caracciolo

Christian feast day:
Francis Caracciolo

Filippo Smaldone

Christian feast day:
Filippo Smaldone

Marc Garneau

Marc Garneau, Canadian astronaut and Member of Parliament (born 1949)

Crowd collapses and crushes

Eleven people are killed and 56 people are injured during a crowd crush incident outside M.Chinnaswamy Stadium in Bengaluru, India for the celebration of Royal Challengers Bengaluru's Indian Premier League victory.

Parnelli Jones

Parnelli Jones, American racing driver (born 1933)

John Blackman

John Blackman, Australian radio and television presenter (born 1947)