EURO supports up to two focused mini-conferences a year.
See http://www.euro-online.org/web/pages/313/euro-mini-conferences for details, funding arrangements and the application form.
A EURO Working Group (EWG) can apply to organise a mini-conference, but it should be in collaboration with at least one other organisation (e.g. another EWG, or a company, or another scientific society). Normal EWG meetings cannot be supported through this mechanism.