Here is a recommendation for whenever you visit Rome, Italy. In the EUR area, you can find an amazing place called Barcellona Cafe. In September 2016 they were organizing a charity event where anyone could come and paint whatever they wanted.
Barcellona Cafe kindly provided the materials and space, and artists were left to create their masterpieces. Imagine a warm summers evening where people are talking and enjoying great food and wine, and either painting themselves or watching artists paint at the same time. Some pieces were later sold and all funds went to charity. It was such a pleasure to be part of such a wonderful event.