IMHO, you need to have an end game for a meet other than a parking lot or a pizza joint to meet and talk about what we all talk about on a daily basis here on our forum.
I would suggest something different like an actual event that enthusiasts are willing to drive several hours for to attend. To do something they have never done or always wanted to do.
Although a little south of the Mid-Atlantic in South Carolina is the Zentrum museum and BMW Spartanburg plant where the X5 was built. I would love to take a plant tour to see all the X models being built including the new X7 and visiting the Zentrum museum on the site.
Even a day trip with an overnight stay through the mountains like Tail of the Dragon in Tennessee would make me want to make the 4 hour trip. I can only imagine the spirited driving during the day and a great gathering for dinner later that night at the hotel.
People are busy in their lives and it is always difficult to get commitment but having an actual end game may help.