Here are some ideas
Adopt a charity. The club I'm in helps out at a boy's home over Thanksgiving and Christmas, as well as taking those kids that are interested on short trail rides. Of course, since the closest OHV park is a couple of hours away, they had to find some private land to wheel on. We also are working at the Warrior Dash in the area, as well as posting the route for the Dirty Kanza bike race this year. I know that some of the members did some work for the Mecum Auction, when it was here. Also, some of them got involved with the KC Auto Show.
Last year, we also did a night at the drive-in, if you can find a drive in. Some of us would meet up for dinner and then caravan to the drive-in. We also did a meet and greet at the local Cabela's this year. Once you get established, check with the local Jeep dealers, see if they might be interested in sponsoring some kind of event. The big thing is to check with the members and see what they want to do.