I have recently heard about a great initiative called 1000 Drawings in Munich. Actually, it already exists in other cities such as Cape Town, Amsterdam, Tuscany, Berlin, and Johannesburg.
What is 1000 Drawings? The idea behind the project is to raise funds for a cause using artwork in A5 format. Everybody can participate, just draw what you want and donate it at the drop off points. You can find where on the 1000 Drawings website (in German). Alternatively, you can send them by post:
On the night of a 1000 Drawings, you can buy artworks for €10 and support a noble cause. I hope it is going to take place this year as well. I am going to update the info here when I learn more.