We strongly advise you to remain flexible when choosing your preferred volunteer program as they can change at short notice, and indeed, new programs are added continuously. For that reason, at the time of booking it is not necessary to specify the program you hope to participate in, only the general area in which you wish to volunteer. Then you can select the exact project during the language course period of your stay.
Also, it’s often possible to prolong your volunteer period for longer than the minimum 4 weeks. This is something you can work out with your coordinator once you are doing your course.