My studio recently competed in the only 50+ ballroom dance competition in the US, in Columbus, Ohio - the Arnold Sports Festival 50+ Dancesport competition. I found the event to be quite welcoming, and enjoyable to participate in. It is not a particularly expensive event, but interestingly it was also not "over attended" as many ballroom dance competitions can be. The organizers, Terry Cavanaugh and Mike Lorz were great hosts. The judges were relatively local but highly competent and knowledgeable, and joys to get to know.