Hi, while there's nothing that says that you can't just "get together", if you want it to be a gc.com listed event, you should keep the guidelines in mind.
Event Caches
Event caches are gatherings that are open to all geocachers and which are organized by geocachers. While a music concert, a garage sale, an organized sporting event, a ham radio field day or a town’s fireworks display might be of interest to a large percentage of geocachers, such events are not suitable for submission as event caches because the organizers and the primary attendees are not geocachers. In addition, an event cache should not be set up for the sole purpose of drawing together cachers for an organized hunt of another cache or caches. Such group hunts are best organized using the forums or an email distribution list.
For geocaching events that involve several components, such as a full weekend event that includes a geocoin trading session, a seminar and a potluck dinner, multiple event listings may be submitted if they each stand on their own merits as events meeting the listing guidelines.
Event caches should be submitted no less than two weeks prior to the date of the event, so that potential attendees will have sufficient notice to make their plans. Events are generally published no more than three months prior to the date of the event, to avoid having the listing appear for a prolonged period of time on the nearest caches page and in the weekly email notification of new caches. Exceptions are sometimes made for events that are designed to attract a regional, national or international group of geocachers, or if an overnight stay is expected as part of the event, requiring advance reservations and travel planning (for example, a campout). Contact your reviewer if you wish to set up such an event, which may be published up to six months prior to the event date. Groundspeak can promote Geocaching through events that may be an exception to the guidelines, if we deem that is necessary to further the game.
After the event has passed, the event cache should be archived by the organizer within four weeks.This was copied from the gc.com site, you can see them yourself by
GOING HERE.
If I can help you in any way, let me know. You should try to contact jffok or geniegill. They're great cachers from down your way.