Why destroy posters of lessons?

A lot of colleagues, in other Countries or in other schools, as per logical, use the "locandina" (poster) to inform peole about the training date of performance, or what the organizators prepared for a specific date. Once finished all, in practical, everyone get out or destry the poster.
We would like to share with you all, some of our locandina, just to give to our followers and colleagues an idea on what to write or publish. We hope yu enjoy this idea!