What was last public appearance?

The last official public appearance of Queen Elizabeth II was on September 5, 2022, when she greeted Liz Truss to formally appoint her as the newly elected Prime Minister of the United Kingdom at Balmoral Castle in Scotland.

On September 8, 2022, Buckingham Palace announced her passing at the age of 96, leading to an extended period of public mourning with widespread coverage of her legacy, memories, and the transition within the British monarchy.