The Princess of Wales is hosting her customary Christmas carol concert at the iconic London venue, with attendees featuring dignitaries, stars, and everyday helpers who have helped their communities.
The large audience will hear a selection of traditional hymns, orchestral pieces, and literary excerpts from performers including award-winning actors.
The central message of the event, held in the glowing Westminster Abbey on Friday afternoon, is generosity and expressing affection towards one's neighbour.
In the audience are Jonathan and Anna Cordiner, whose daughter died of a brain cancer, and who founded an organisation, a support fund, to support families who have a terminally ill child.
"The time, care and compassion you give, often discreetly and without words, and without any thought of thanks or praise, make an remarkable change to the circumstances of individuals," the Princess expressed in a letter ahead of the concert.
The royal has been undertaking her own steady comeback to public life after her cancer diagnosis and chemotherapy, last month delivering her major oration since 2023, in which she reflected on recognising the "selfless, commonly overlooked efforts of carers".
Guests arriving at the Abbey will enjoy performances from budding artists backed by the Future Talent charity, co-founded by the former royal to broaden opportunities for musical tuition.
Carys Wood, aged 18, who performs on the trumpet and is from Wales, has been supported by the charity, with awards contributing to instruments, tuition, and transportation expenses - and she said it was "amazing" to be performing at the evening's event.
"Musical pursuits are frequently pricey," she stated. She is now studying at the Royal Academy of Music, and added that "all people deserve the chance" to develop their musical skills.
Her younger sibling Eliza, aged 11, who performs on the brass instrument, will also be at the Abbey. "It's unbelievable that I get to perform here in front of so many distinguished guests," she said.
Attending the service will be representatives of different generations.
That will include nine-year-old Saphia Turner, recipient of a young hero award, who creates and sells art and completes fundraising tasks to collect donations for food banks.
The Abbey has been festooned with handcrafted festive wreaths, with well-known chef Mary Berry and flower expert Simon Lycett assisting in their creation.
Among the musical performers will be Katie Melua, the Abbey's own choir and a Cornish sea shanty group, Fisherman's Friends, who said the opportunity to perform was "a dream come true."
This annual carol service will be televised and shown on a major network on Christmas Eve.