@capmisson there’s a good chance the NGI0 Discovery program of the European Commission could commit funds to organize such an event. If you can talk to Francesca Bria, I guess the city of Barcelona might want to join as well and provide space.
I would be interesting to discuss the format of the event.
I don’t think the one-to-many traditional conference type is useful here. Since attendees will also be AP developers, it makes more sense to prepare a few topics in advance, hack some code together, and generally be more horizontal and peer-to-peer than a classical developer conference. Fly in, stay a day, fly out is an irresponsible model for conferences; intead the format of the APConf should reflect the ethics behind this kind of technologies, which seems to me unrelated to that mode of existence promoted by the corporate model. Instead, people should be prepared to move slow, stay longer, live together for a while. I know it sounds hardly possible, but so did Web federation not so long ago.