A fixed date, a programme published in spring
Lisbon's patron saint is celebrated on 13 June, the municipal holiday, and the city's biggest night is the eve, 12 June, when the Marchas Populares descend Avenida da Liberdade and the neighbourhood arraiais fill Alfama, Graça, Mouraria and Bica. EGEAC, the municipal cultural company, presents the Festas de Lisboa through June and publishes the dated programme in spring; the Grande Marcha is a joint initiative of the Câmara Municipal de Lisboa and EGEAC. Treat the 2026 pattern as a shape, not a schedule.