regarding the activity discussion (@dimaip) I would generally refer to our discussion in Frankfurt: Activity discussion – Neos Sprint 2015 – Frankfurt
Of course, we need to flesh this out more and actually apply it in action 
@radmiraal: the sponsoring for people to come to sprints is a valid and also delicate topic. We need to discuss this in more detail, as we probably don’t want to give out acknowledgements in an inflationary manner but on the other hand of course we want to recognize time and money spent for the project. I need to think about this…