On January 1, 1973, when Britain joined the European Economic Community (EEC), two other countries also joined: Ireland and Denmark. This expansion marked a significant moment in European integration, as these three nations became part of the EEC alongside the original members.
The countries that fought in D-Day were US, Britain,France and Russia.
None is same as India (August 15th). The closest is Pakistan (on August 14th)
Rupert's Land and the Northwest Territories were transferred from Britain to Canada on July 15, 1870. The Province of Manitoba was created by the Canadian government on the same day.
December 26th is known in Britain as Boxing Day, and in many other countries as St Stephen's Day.
The USA, Canada, Australia, New Zealand and many smaller countries were with Britain on D-Day.
Christmas and Easter are the same but Britain doesn't celebrate Presidents day, Columbus day, Independence day or Thanksgiving.
Denmark.
Ireland.
As Canada was a dominion of the British Empire, it joined the war the same day Britain declared war on Germany and the Central Powers; the 4th of August 1914.
Great Britain, or the United Kingdom, doesn't celebrate an independence day.
America, Britain, France, and maybe more