"In late spring and early summer there are quite a few festivals," explained Colleen McCann, a long-time member of the organisation, as she showed me around San Michele"s vineyard. "Each campo [city square] has its own different celebration, and on the solstice in June there"s three days of festivities at the [Church of San Giovanni in] Bragora. We go there and offer people an ombra [small glass] of wine, with the idea being to let the city know about Venice"s historical vineyards."