Events in Bussana are often spontaneous, so it is nearly impossible to keep track of them.
The main restaurants, the Casaccia, the pink colored place just before town, and the Osteria degli Artisti, at the entrance of town, ususally advertise events no more than a few weeks in advance.
Best is to have look at the following webpages:
At the entrance of town you'll find an announcement board where everyone who plans any events, from dance classes to film or tombola evenings, will post it.