"Aperitivo" is one of those great Italian words/things that has no exact literal translation in English - not in a single word anyway. It is sort of like saying "let's go have a drink and a snack" in one word.
"Aperitivi Ad Arte" is that, plus art - Aperitivo in some of Florence's most famous museums. Imagine having a cocktail, a prosecco, or a glass of wine and enjoying some of Tuscany's famous appetizers while viewing the treasures of the Uffizi, Accademia and Bargello museums. This is "Aperitivi Ad Arte" and is happening now through September 26th.
The official page for info is here, but the SACI Art blog also has a version in English. €15 per person, and you must call to reserve - 055-294883.