I think you're asking if there is an organizer or coordinator who organizes events, rather than a moderator who looks after the forum.
In the regional groups, generally events arise on an ad hoc basis as individuals propose them and have the energy to put them together. Some people do this more often than others, so they tend to become the organizers naturally, but in general there is no official structure or hierarchy for these groups, at least not for now, as the events tend to be fairly small, but I suppose that like other things on APUG that have grown in size, there may eventually need to be more structure.