King Charles III, Queen Camilla and Prince William will visit Aberfan on 21 October for the 60th anniversary of the disaster that killed 116 children and 28 adults, BBC Wales reports.
Six decades ago, a colliery spoil tip collapsed above the village near Merthyr Tydfil, sending coal slurry crashing into Pantglas Junior School and surrounding houses. The royals will join survivors, bereaved parents and members of the community to pay tribute to those who died.
The visit will begin at the Aberfan Memorial Garden, which stands on the site of the primary school, where a short prayer and a moment of silence will be held. King Charles and Prince William will lay wreaths, and Queen Camilla will place a posy in memory of those who were lost.
At the Aberfan and Merthyr Vale Community Centre, the royals will meet retired emergency service workers who responded to the collapse, including a 96-year-old woman who served as a police officer at the time. An exhibition showing the scale of the rescue effort will be on display.
The late Queen Elizabeth II's reaction to the disaster was said to be one of the biggest regrets of her 70-year reign.