I put on a wine tour for a car club I belong to and I keep it simple. I plan a start time and location, the route and the stops, provide directions and ask who will be attending so we can let the restaurants, wineries, etc, know how many people they can expect. Done.
Putting on a C&V bike event can be the same formula but you let people know this ride is geared (ha!) towards vintage bikes so if you want to bring your latest whiz-bang CF bike, GREAT! I've heard they are fabulous but the pace is for old-er bikes so you may get bored waiting for the group and/or the speeds that will be ridden. Again, done. KISS...
My 2 cents...