Fair of Sant Antoni de Castellterçol Activity · Castellterçol, Moianès, Barcelona Image of Castellterçol, not of the place itself. The Fira de Sant Antoni de Castellterçol is held on 17 January, the feast of Sant Antoni Abat, as a tribute to farmers, woodsmen and traders. The Gremi de Traginers, which brings together Castellterçol, Castellcir, Sant Quirze Safaja and Granera, preserves a banner from 1892; the day includes three laps on horseback around the Plaça Prat de la Riba and the traditional tortell de Sant Antoni. Photo: Enfo (CC BY-SA 3.0) What to see and do in Castellterçol