I have two other FJR buddies and all three of us are former BMW riders/owners. We usually attend the BMW MOA National (we went last year to Springfield, MO and there were about 5000 riders in attendance), however, our favorite is the BMW RA National Rallies as they average around 1000 or so attendees. I only wish we could arrange a Central Owners Meeting sometime.
And don't forget about the BMW Hiawatha Rally that usually has demo bikes to ride (thanks Leo's South!!) that is usually held in early June in Money Creek, MN.
Anyway, welcome and good luck finding a FJR to ride!