I will also chime in an say the same as others, there is nothing “official”. You can start your own group. Other groups can start up in the same town. There isn’t really anything anybody can do about it. I’m not even sure what legal standpoint you would have if another group started using your group’s name and custom logo TBH. Mooglie is the copyrighted trademark of Sony / Ghost Corp. Just because a group adds a palm tree or a fire helmet to the logo doesn’t make it theirs.
You also run into the issue of some groups not knowing other groups even exist. We aren’t ran by a company like we would be if our franchises were real. My friend and I started using the name “Southern Illinois Ghostbusters” 20 years ago. As far as I could tell at the time, we were the only GB group between St. Louis MO and Louisville KY. Within the last 10 years or so, another “Southern Illinois Ghostbusters” and “Ghostbusters of Southern Illinois” and a few others have popped up, each time presenting like they were the first in the area. It is what it is. Nobody asked us for permission to use the name, and permission is not ours to give because we are not a real company. We have also never been asked if anybody can join us. And, if I’m being honest, I can’t say that I would want to join another group in the area either.
If anything, I think when the fan franchise thing kicked off, a lot of groups went too big. By that I mean, they would name their franchise after their state or a very large part of it. The original concept of the Ghostbusters is that they operated like firefighters. One fire station isn’t going to cover an entire state. In fact, you may have multiple fire stations in a single town or city. Or, more locally, you may have multiple DEPARTMENTS in the same town. Within the city limits of Mt Vernon, you have the Mt Vernon Fire Department, as well as Jefferson County Fire Protection District. And while 3 different towns, Benton, West City, and Steel City share boarders and all have their own fire departments. You also have multiple ambulance services stationed in towns together, and other towns that don’t have ambulance services at all.
Ok, I will reel in the rant here lol. Basically, everybody can do what they want and just try to play nicely with each other. Maybe reach out to the other group and make contact. Let them know you are also in the area, that you have no desire to step on each others toes, and that you will not be trying to represent the other group and hope that they extend you the same courtesy.
If we had a better organizational system in place, we could work out a little better naming system or something. Like all of the groups in the same area and with basically the same name would also have their own “station number” or something. Use their own logos still, have their name, but still be able to distinguish one from the other. But, nothing like that has ever really existed for this fandom.