From the announcement:
We are running a 24-hour painting marathon from noon on Saturday, August 16th for Save the Children. Save the Children works in 120 countries (inc. the UK) mainly in South America, Asia, the Middle East and Africa. The charity's work includes areas blighted by war, such as Congo, Syria and the Occupied Palestinian Territories.
Getting involved improves the lives of children and allows you to get a load of figures painted!