Once you've gathered the group, the wiki page, and the big ideas on what you want to do, visit the Wikimedia user group application page
and apply for recognition. The Affiliations Committee may ask you some questions, review your application, and if appropriate will submit them to the Wikimedia Foundation to recognize your group as an official Wikimedia User Group. Initial recognition is normally for one year, and is then reviewed. Recognition can be suspended or removed if necessary if a group becomes inactive.