King Charles has described the Commonwealth as “rare and precious” in his annual message to the 56 member nations, released ahead of tomorrow’s Commonwealth Day celebrations.The monarch emphasised the organisation’s role as a space for candid dialogue during turbulent times, stating: “In a world that can feel increasingly fragmented, this voluntary union of free association remains rare and precious a forum for open and honest discussion and debate to help improve the lives of the nearly three billion people who call our member states home.”His Majesty also pointed to significant economic opportunities, noting the bloc possesses “untapped potential for prosperous trade between trusting partners” while highlighting that nearly two-thirds of Commonwealth citizens are under 30.The annual service at Westminster Abbey tomorrow will bring together senior members of the Royal Family, with the King and Queen joined by the Prince and Princess of Wales, the Princess Royal and Vice Admiral Sir Tim Laurence.King Charles has praised the Commonwealth ahead of Commonwealth Day on Monday | GETTY Prime Minister Sir Keir Starmer is expected to attend alongside senior Cabinet ministers, with the congregation numbering approximately 1,800 guests.High commissioners from across the Commonwealth nations will be present, along with young people and prominent figures from the creative industries.This year’s service draws inspiration from the theme of the upcoming biennial Commonwealth meeting, scheduled for the first week of November in Antigua and Barbuda’s capital.Spice Girl Geri Halliwell-Horner, who serves as an ambassador for the Royal Commonwealth Society organising the event, will deliver an address during the service.Former Strictly Come Dancing judge Oti Mabuse will offer a reflection, bringing her perspective to the celebration of Commonwealth unity.Prime Minister Sir Keir Starmer, as well as senior Cabinet members will be at the event | GETTY Poetry will feature prominently, with Selina Tusitala Marsh, who holds the position of inaugural Commonwealth Poet Laureate, set to perform an original piece.The service aims to celebrate collaboration as the defining characteristic of the modern Commonwealth, bringing together leading voices from across the creative community to mark the occasion.The service will showcase a diverse array of performances, headlined by the world premiere of the Commonwealth Symphony, a new work by composer Rekesh Chauhan.A specially created dance piece will unite the Royal Ballet School with Sapnay Entertainments, blending classical ballet with Bollywood choreography to embody the spirit of cross-cultural partnership.King Charles will lead the ceremony at Westminster Abbey | REUTERSMusical contributions will span the Commonwealth’s rich cultural tapestry, featuring a Scottish ceilidh band alongside the Melodians Steel Orchestra.Additional reflections and readings from various guests will complement the artistic programme, reinforcing the theme of accelerating partnerships and investment for a prosperous Commonwealth.