If you want to have fun with people who like Motorcycles and ride them go to a "Guzzi" rally.
I think the same can be said for Gold Wing events, at least here in Norway. Here, they are family events. None of this stupid drinking until you fall over, or incessant burnouts throughout the night. Rallies for old bikes are also quite relaxed and "grown up". Personally, I shy away from rallies because I do not like crowds, but I can pop in to watch some bikes if it is early enough in the day that people have not gone drunk yet. Oh, nor entirely true - I actually participated in an Adventure/offroad rally in Safsen, Sweden, back in 2017. There were more than 500 riders, but all stayed in cabins, allowing us who wanted to keep private, while those who wanted to party with lots of others could go to the ballroom. Most stayed with their small groups in their cabins - I was among the youngsters at 53, which may explain the lack of wild partying.
Did I mention I am a boring fart?