Historical Events on July 20

Battle of Lissa — 1866 naval battle where an Austrian fleet defeated an Italian fleet, also the first major sea battle between ironclads

Preußenschlag — Prussian Coup. During the Weimar Republic the Free State of Prussia was overthrown.

Reichskonkordat — treaty negotiated between the Vatican and Nazi Germany in 1933

20 July plot — attempt to assassinate Adolf Hitler, 1944

1957 British Grand Prix — Formula One motor race held in 1957

1963 British Grand Prix — Formula One motor race held in 1963

1968 British Grand Prix — Formula One motor race held in 1968

1974 British Grand Prix — Formula One motor race held in 1974

2003 British Grand Prix — Formula One motor race held in 2003

2008 German Grand Prix — Formula One motor race held in 2008

2012 Aurora shooting — mass shooting in a movie theater in the United States