Wikipedia:Selected anniversaries/Table

October 20

Pope Pius XII

• 1939 – Pope Pius XII (pictured) published his first encyclical, Summi Pontificatus, which critiqued ideologies such as racism, cultural superiority and totalitarianism.
• 1951 – African-American college football player Johnny Bright was the victim of an on-field assault, eventually leading to changes in NCAA football rules that mandated the use of more protective helmets with face guards.
• 1967 – Roger Patterson and Robert Gimlin filmed an unidentified subject, which they claimed was Bigfoot, at Six Rivers National Forest in California.
• 1984 – The Spanish trawler Sonia sank in British waters after a five-hour chase by the Irish Naval Service patrol vessel Aisling, during which almost 600 shots were fired.
• 1991 – An earthquake struck the Indian state of Uttarakhand, killing at least 768 people and destroying thousands of homes.

October 21

Aftermath of the Seongsu Bridge disaster

• 1096 – First Crusade: At the Battle of Civetot, the Seljuk forces of Kilij Arslan destroyed the army of the People's Crusade as it marched toward Nicaea.
• 1867 – The first and second of three treaties were signed near Medicine Lodge, Kansas, between the United States federal government and several Native American tribes in the Great Plains, requiring them to relocate to areas in present-day western Oklahoma.
• 1941 – World War II: German soldiers massacred nearly 2,800 Serbs in Kragujevac in reprisal for insurgent attacks in the district of Gornji Milanovac.
• 1968 – At the height of the Japanese university protests, protesters occupied Shinjuku Station in Tokyo and clashed violently with police.
• 1994 – In Seoul, South Korea, 32 people were killed and 17 others injured when a span of the Seongsu Bridge collapsed (pictured).