Were trying for the reward for dancing around the tower. We haven't gotten 2 full circles yet. Not sure if that's what's required. I wonder if there even is a reward. I wouldn't be surprised if it switched to a cutscene where that guy from UHF appears to tell you what you've won.
Did you see Great Edo of Nippon v1.15 (post Bon Festival)?
The thread you linked talks about the dance ring reward, but does not confirm it's existence or lack thereof.