The document discusses 10 popular festivals in the UK, including the Jorvik Viking Festival in York celebrating the city's Viking history, Jack in the Green celebrating spring in Hastings, the Hay Festival literary event in Hay-on-Wye, Cooper's Hill Cheese-Rolling competition in Gloucester, Highland Games showcasing Scottish culture, Notting Hill Carnival celebrating London's diversity, and Robin Hood Festival reenacting legends in Sherwood Forest. Many festivals have historical origins and attract large crowds, so accommodation may book up quickly.