El Montmell Main Festival Activity · el Montmell, Baix Penedès, Tarragona Image of el Montmell, not of the place itself. Main festival of Montmell, a town in the comarca of the Baix Penedès (Tarragona). The article on the town places it in la Joncosa, the capital of the district, where it is celebrated on the first weekend of August. The local festive calendar also includes the fira de Sant Pere, on 29 June, and the grape-harvest festival, in autumn. Photo: Enric (CC BY-SA 4.0) What to see and do in el Montmell