Pick an interesting one or just learn about history. There's a good one for you Carl.
https://en.wikipedia.org/wiki/May_5
1905 – The trial in the Stratton Brothers case begins in London, England; it marks the first time that fingerprint evidence is used to gain a conviction for murder.
1904 – Pitching against the Philadelphia Athletics at the Huntington Avenue Grounds, Cy Young of the Boston Americans throws the first perfect game in the modern era of baseball.
Denton True "Cy" Young (March 29, 1867 – November 4, 1955) was an American Major League Baseball pitcher. During his 22-season baseball career (1890–1911), he pitched for five different teams. Young established numerous pitching records, some of which have stood for over a century.
1973 – Secretariat wins the 1973 Kentucky Derby in 1:59 2/5, an as-yet unbeaten record.
Secretariat (March 30, 1970 – October 4, 1989) was an American Thoroughbred racehorse who, in 1973, became the first Triple Crown winner in 25 years. His record-breaking victory in the Belmont Stakes, which he won by 31 lengths, is widely regarded as one of the greatest races of all time.