The organisers have issued an update to that announcement: new dates! new deadline! a new initiative!
New Dates! now 10 – 12 June 2016 placing it in the middle of the festival.
New Deadline! now 20 November 2015 (date put back from 1 November) is the date by when your 250 word proposal for papers, posters, panels, round tables, video-feeds, workshops, demonstrations etc. must be submitted to email@example.com.
New Initiative! “Possible Worlds: A Global Invitation” the way that children will be able to contribute and add their voices regardless of distance.
Full information about this is in THIS document in English, French & Spanish.