Su e zo per i ponti is one of the many non-competitive track events which are organised in the city at all seasons. The walk takes place on a March or April Sunday (the date changes every year); a great number of Venetians as well as substantial groups coming from different places take part in it. The route starts from the Ponte della Paglia and winds along the city calli, fondamente and campi, passing through most sestieri as far as the finishing post in Piazza San Marco.