Assassin's Creed 2 Episode 16: Carnevale

"During the famed Venetian Carnevale celebration, Ezio Auditore visited his friend Leonardo da Vinci, in order to ask him for a spare mask that he could use to hide his identity during the event."
"After Ezio met up with Antonio de Magianis in the Dorsoduro district of Venice, their chat was soon interrupted by the murder of a courtesan in a nearby street."
"After the courtesan's murderer was killed, Ezio Auditore, Antonio de Magianis and Teodora Contanto made their way to the Carnevale."