Commonwealth Day Service Join the Royal Family in Westminster Abbey on Commonwealth Day 2024 for the annual multi-faith service. The Commonwealth Service at Westminster Abbey, held since 1972, celebrates the diverse cultures and people of the Commonwealth nations, comprising 54 member states with a population of 2.4 billion. Commonwealth Day 2023 marks the tenth anniversary of the signing of the Commonwealth Charter, which was signed by Her late Majesty Queen Elizabeth II on 11 March 2013. Cost: FREE This event has been fully booked. In case you have any queries about this or future events, you may contact our Membership & Admin Officer, Mahima Narayan, at [email protected].