Halloween

 Happy Halloween https://localhistories.org/a-brief-history-of-halloween/

Philadelphia

 Happy birthday Philadelphia. William Penn founded the city on 27 October 1682.

Agincourt

 On 25 October 1415, the English won a decisive victory over the French at Agincourt. The longbow proved to be, once again a very effective weapon. https://localhistories.org/a-history-of-the-longbow/

Alaska

 On 18 October 1867 Alaska passed from Russia to the USA. localhistories.org/a-history-of-alaska

Henry Cavendish

 The great scientist Henry Cavendish was born on 10 October 1731. Among his achievements, he discovered hydrogen and measured the density of the Earth. https://localhistories.org/a-brief-biography-of-henry-cavendish/

Tea

 On 3 October 1952 tea rationing ended in Britain. It had been rationed for 12 years! How did people manage when tea was rationed? https://localhistories.org/a-brief-history-of-tea/