Festivities of Tierga Activity · Tierga, Aranda, Zaragoza Image of Tierga, not of the place itself. Main festivities of Tierga from 29 August to 1 September, in honour of Santa Rosa de Lima and San Ramón Nonato; on 3 and 4 May the Santo Cristo is celebrated and on 8 December la Purísima. Photo: Ecelan (CC BY-SA 4.0) What to see and do in Tierga