Drupal Dev Days is the biggest developer focused Drupal gathering in Europe each year. Last year there were close to 600 signups for the event in Brussels. It is going to be a big event in an area full of interest for multilingual topics, so it is evident that we should organize a sprint around it. The organizers already secured sprinting space in Citilab (the conference venue) for the whole week before the event.
Planned dates for the sprint are: June 11 (Mon), 12 (Tue), 13 (Wed), 14 (Thu) and possibly 15 (Fri) 2012.
People from all experience levels are welcome (people with no development experience can help validate UIs and workflows and plan out improvements). Developers of intermediate to advanced developers can be most useful but we might be able to provide guidance to beginners as well, depending on the lineup of people available.