The RPBA , Jammin on the James , has been around since 1988, and has grown from 35 boats to 83 boats and have to cut it off due to dockage,14 on waiting list now. This year we sent out the registrations in Janurary and sold out in less than 1 month, we never have even come close to that before, sold out but only a week before the event in July. What has our done ours the best was the Food & Band, we hired one of the best bands in the Mid-Atlantic area (THE WORX). The run can also be done by 21 foot boats. We have a great dock spot, already drawn out and each person already knows where they are going when they pull in. T-shirts are a little plus, we changer the design last year for the first time in 10 years, different.
To keep it fresh and people coming back , I think you have to keep the run fresh and exciting & something NEWevery year.
Helicopter video & pics a must have.
Hope this helps.