The Princess of Wales is hosting her annual Yuletide celebration at Westminster Abbey, with a congregation comprising dignitaries, stars, and everyday helpers who have made a difference in their neighbourhoods.
The large audience will enjoy a selection of carols, music and readings from actors such as award-winning actors.
The central message of the event, held in the candle-lit 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 set up a charity, Kayleigh's Wee Stars, to help households where there is a youngster facing a life-limiting condition.
"The dedication, empathy, and kindness you show, often discreetly and without words, and without any thought of thanks or praise, make an extraordinary difference to the lives of others," wrote Catherine in a letter ahead of the festive gathering.
The princess has been making her own measured re-emergence to official duties following her health challenges and treatment, recently giving her major oration since 2023, in which she talked about recognising the "discreet, frequently unseen labour of caregivers".
Attendees entering the Abbey can listen to talented youth performers backed by the Future Talent organisation, established in part by the late Duchess of Kent to broaden opportunities for musical tuition.
Carys Wood, aged 18, who plays the trumpet and is from Pembrokeshire, has been supported by the charity, with awards contributing to instruments, tuition, and transportation expenses - and she said it was "awesome" to be taking part in the evening's event.
"Pursuing music is often costly," the musician remarked. She is now studying at the Royal Academy of Music, and added that "everyone should have the opportunity" to hone their artistic talents.
Eliza, Carys's sister who is 11, who is a euphonium player, will also be at the Abbey. "I never thought I'd be able to play there in front of so many notable figures," she said.
Within the audience will be people from various age groups.
That will include young Saphia Turner, nine, honouree of a prize for youthful altruism, who sells artwork and carries out sponsored challenges to collect donations for community pantries.
The Abbey has been adorned with specially made wreaths, with TV cook Mary Berry and florist Simon Lycett helping to make them.
Among the musical performers will be recording artist Katie Melua, choristers from Westminster Abbey and a maritime folk band from Cornwall, Fisherman's Friends, who said the chance to take part was "a dream come true."
The Together at Christmas carol concert will be televised and shown on television on December 24th.