STORY: Biden chatted with some attendees and Sunak took pictures with them.
Jill Biden attended with her grand-daughter Finnegan Biden. Sunak's wife, Akshata Murty, guided them around the guests' tables.
The coronation lunch hosted by the Prime Minister had guests including Ukrainian families and youth groups.
Neighborhoods around Britain held street parties as part of a long weekend of celebrations marking King Charles III's coronation.