1985 Coca-Cola - New Coke
https://www.coca-colacompany.com/company/history/the-story-of-one-of-the-most-memorable-marketing-blunders-ever
1940 Rhythm night club fire
https://theclio.com/entry/80724
1968 UK Decimalization
http://news.bbc.co.uk/onthisday/hi/dates/stories/april/23/newsid_2523000/2523895.stm
1985 Coca-Cola - New Coke
https://www.coca-colacompany.com/company/history/the-story-of-one-of-the-most-memorable-marketing-blunders-ever
1940 Rhythm night club fire
https://theclio.com/entry/80724
1968 UK Decimalization
http://news.bbc.co.uk/onthisday/hi/dates/stories/april/23/newsid_2523000/2523895.stm