Informal learning is becoming more organised (if that isn't a contradiction). If you want to learn something the net is full of free resources that can inform, inspire, instruct and provoke. There's no need to wait for someone to organise a course to attend, you just get started. Pick and choose from thousands of online lectures from the world's universities, read articles and open scientific journals, read blogs and participate in discussion groups. It's all out there but few people are able to really exploit these opportunities. Most people do not have the information literacy skills to find the material, make advanced searches, check the validity and so on. You also need to find others with similar interests who can support you and provide you with feedback. You need to find a network to help you learn.