I know this is along way off, but Ocean City's bike week in Maryland is HUGE, and there were only three of us (that I saw in a week) with R3's. I don't have the exact date, but it's always right around 9-11. They pushed it back one week this last year so it didn't fall on 9-11.
It was AWSOME, since there is just one main drag through town you can sit alongside and watch thousands of bikes roar by. There is never a problem with lodging, most of OC is seaside hotels anyway. Going back over the bridge to the mainland gets you out of the noise and a couple miles away is one of the nicest camp grounds I've ever seen.
I highly recomend it, perfect time of the year too ... not too hot, not too cold.