St. Martin's Day has long assumed the role of the most important autumn event in Santarcangelo di Romagna, gaining a well-deserved reputation as an authentically popular fair whose notoriety far exceeds local borders.

In particular, there are two features that make it a nationally known event
- the storytellers, who meet every year on the occasion of the National Fair dedicated to them
- the 'horns' hanging under the arch in the central Ganganelli square are supposed to signal, by swinging, whether the person passing underneath them at that moment has been the victim of betrayal by their beloved.

Another feature that attracts many visitors to the St Martin's Fair is the food: from typical products from many Italian regions to specialities from Emilia-Romagna, and the many refreshment stands ready to satisfy every request, from piadina to polenta.

In addition to the traditional street market, there are also exhibitions of old things, artistic handicrafts, cars and agricultural machinery, of which the city is cheerfully 'invaded' even in the most secluded and far-flung corners.