Gloucester the remains (a gateway and some walls) of Llanthony Secunda Priory, a cell of the mother abbey in the Vale of Ewyas, Monmouthshire, which in the reign of King Edward IV became the secondary establishment. The Three Choirs Festival, originating in the 18th century and one of the oldest music festivals in the British Isles, is held in Gloucester every third year, the other venues being Hereford and Worcester. Gloucester hosted the festival in 2016, and it is next due in the city in 2019. The city's main theatre and cultural venue is the Guildhall. The Guildhall hosts a huge
Gloucester festival in the South West. The main museum in the city is The Museum of Gloucester but there are several other important museums. The Tailor of Gloucester House which is dedicated to the author Beatrix Potter can be found near the cathedral. Since 2013 Gloucester has marked Armed Forces Day with a Drum Head Service held on College Green in the shadow of the cathedral. This is followed by a parade of serving forces, veterans and cadets through the city centre to the docks for a family day with military and military-related charity displays and entertainment in Back Badge Square