Thank you again to the 50 (!) people who responded. A first followup after a meeting with Iolanda yesterday. There will be more later I think, e.g. this month there is a meetup to talk about program.* The registration form will definitely include an option to donate some money for the scholarships fund. There was a substantial interest in this option. We plan to provide partial scholarships/discount codes of 300 € each, see also https://meta.wikimedia.org/wiki/Wikimania/Scholarships/2016 for current budget info and of course https://wikimania2016.wikimedia.org/wiki/Scholarship_committee . As for the question on (variable) costs, the answers varied a lot. The registration form is also expected to clear up any confusion, because every single service/offering will be labeled with its actual cost. Any unexpected saving will also go back to (future) Wikimania scholarships funds or similar.