organizing better in-person meetings

In-person meetings, such as the ones organized by Extremadura, are a great opportunity for Debian. However, many participants to the various meetings held in the past feel that the way they were organized is suboptimal. For example, some participants prefer to use those meetings for discussions rather than usual Debian work, but then it's difficult to get some other people involved in the discussions. Ideally, the outcome of this BOF will be an HOWTO about how to organize successful meetings. With requirements, tips and tricks to get people involved, etc.