Regular (or more spontaneous) face-to-face meetings of Wikipedians take place in cities around the world. This page is used as a starting point for Wikipedians organising meetups, and subpages are used for finalising the details once a meetup has been agreed. For meetings in other languages/places please use the interlanguage links from this page.
Don't manually post notices to all the editors who are listed in a geographical category. Simply post a request at WP:BOTREQ, asking for a bot owner to have a bot deliver the (specified) message to everyone in the category.
Contact your local chapter - if you have one - who will be able to contact people in the local area, or help you in other ways.
Organize eating arrangements
Settle on a definite time and place, and don't change it. If someone is just bold, people will know about the date a few weeks in advance (instead of a couple of days), which will make planning easier for individuals. Getting input from everyone is good, but you don't need a formal vote on everything, which can delay the process.
Consider whether you want any sort of agenda for the meetup (like a discussion on a specific topic, or forming a local chapter).