Question: What is the name of the ruined medieval castle in Edinburgh, Scotland, that was involved with the Community Arts Movement starting in 1967?

Context paragraphs:
Ogrodzieniec Castle: Ogrodzieniec Castle is a ruined medieval castle in the semi-mountainous highland region called the Polish Jura in south-central Poland.  Rebuilt several times in its history, the castle was originally built in the 14th–15th century by the Włodkowie Sulimczycy family.  The castle is situated on the 515.5 m high Castle Mountain (Polish: Góra Zamkowa), the highest hill of the Kraków-Częstochowa Upland.  Located on the Trail of the Eagles' Nests, the ruins are opened for visitors.

Château Gaillard: Château Gaillard ("Strong Castle") is a ruined medieval castle, located 90 m above the commune of Les Andelys overlooking the River Seine, in the Eure "département" of Normandy, France.  It is located some 95 km north-west of Paris and 40 km from Rouen.  Construction began in 1196 under the auspices of Richard the Lionheart, who was simultaneously King of England and feudal Duke of Normandy.  The castle was expensive to build, but the majority of the work was done in an unusually short time.  It took just two years, and at the same time the town of Petit Andely was constructed.  Château Gaillard has a complex and advanced design, and uses early principles of concentric fortification; it was also one of the earliest European castles to use machicolations.  The castle consists of three enclosures separated by dry moats, with a keep in the inner enclosure.

Whorlton Castle: Whorlton Castle is a ruined medieval castle situated near the abandoned village of Whorlton (at grid reference NZ4802) in North Yorkshire, England.  It was built in the early 12th century as a Norman motte-and-bailey associated with the nearby settlement.  The castle is an unusual example of a motte and bailey that remained in use throughout the Middle Ages and into the early modern period.  Built to overlook an important road on the western edge of the North York Moors, the castle fell into ruin as early as the mid-14th century.  The site nonetheless continued to be inhabited until at least the early 17th century.  Little now remains of the castle itself, other than the remnants of some cellars or undercrofts.  The ruined shell of a 14th-century gatehouse still survives, albeit in fairly poor condition.  It is a listed building and is privately owned but can be visited by the public.

Airds Castle: Airds Castle is a ruined medieval castle near Carradale, Kintyre, Argyll and Bute, Scotland.  The castle held a position on the summit of a rocky headland between Carradale harbour and the bay of Port Righ, looking across Kilbrannan Sound to the Isle of Arran.

Heighley Castle: Heighley Castle (or Heleigh Castle) is a ruined medieval castle near Madeley, Staffordshire.  The castle was completed by the Audley family in 1233 and for over 300 years was one of their ancestral homes.  It was held for Charles I during the English Civil War and was destroyed by Parliamentary forces in the 1640s.  The ruinous remains comprise masonry fragments, mostly overgrown by vegetation.  The site is protected by Grade II listed building status and is a Scheduled Ancient Monument.  The castle is privately owned and is not open to visitors.

Barnard Castle (castle): Barnard Castle (grid reference [ NZ04911641] ) is a ruined medieval castle situated in the town of the same name in County Durham.  It is a Scheduled Ancient Monument, and was designated as a Grade I listed building in 1950.  The remains of the medieval chapel of St Margaret in the outer ward are listed as Grade II.

Tutbury Castle: Tutbury Castle is a largely ruined medieval castle at Tutbury, Staffordshire, England, in the ownership of the Duchy of Lancaster.  It is a Scheduled Ancient Monument.  People who have stayed in the castle include Eleanor of Aquitaine and Mary, Queen of Scots, who was a prisoner there.

Donnington Castle: Donnington Castle is a ruined medieval castle, situated in the small village of Donnington, just north of the town of Newbury in the English county of Berkshire.  It was founded by Sir Richard Abberbury the Elder in 1386 and was bought by Thomas Chaucer before the castle was taken under royal control during the Tudor period.  During the First English Civil War the castle was held by the royalist Sir John Boys and withstood an 18-month siege; after the garrison eventually surrendered, Parliament voted to demolish Donnington Castle in 1646.  Only the gatehouse survives.  The site is under the care of English Heritage and is protected from unauthorised change as a scheduled ancient monument.

Craigmillar Festival Society: The Craigmillar Festival Society (CFS) was a Community Arts organisation that existed in the Craigmillar area of Edinburgh, Scotland from 1962 to 2002.  It is regarded as important contributor to the Community Arts Movement.  Starting in 1967, many of its productions involved Craigmillar Castle.

Craigmillar Castle: Craigmillar Castle is a ruined medieval castle in Edinburgh, Scotland.  It is 3 mi south-east of the city centre, on a low hill to the south of the modern suburb of Craigmillar.  The Preston family of Craigmillar, the local feudal barons, began building the castle in the late 14th century and building works continued through the 15th and 16th centuries.  In 1660 the castle was sold to Sir John Gilmour, Lord President of the Court of Session, who made further alterations.  The Gilmours left Craigmillar in the 18th century, and the castle fell into ruin.  It is now in the care of Historic Environment Scotland.

Supporting paragraphs: Craigmillar Festival Society Craigmillar Castle
Answer: Craigmillar Castle