Olost Main Festival Activity · Olost, Lluçanès, Barcelona Image of Olost, not of the place itself. The Festa Major d'Olost is celebrated around August 15, the feast of the Assumption of the Virgin; the central day includes a solemn mass and the dance of the gegants of Olost accompanied by the town's xistulaires. 13-16 d'agost Photo: Viquipèdia / Wikimedia Commons (CC BY-SA) What to see and do in Olost