The patroness of Erba is Saint Mary the Nascent, celebrated on 8 September in the church of the same name.
In the district of Incino, on the Saturday and Sunday of the third week of October, the historic Sagra del Masigott is held, mainly in the Piazza del Mercato, next to Piazza Sant'Eufemia, home to the ancient pieve. The municipal territory also holds the Castello di Pomerio and the Castello di Casiglio, as well as the «Licinium» open-air theatre.