If I could offer some constructive feedback?
Personally — and it’s just my opinion — I find the in-game /dance emotes immersion-breaking, especially for what is supposed to be a graceful, Thalassian themed ball. It was why my character left early: I saw no way to participate in the event and remain in character, and I’m sorry for that.
An example of a good, immersive dance event style, in my opinion, is the dance nights Acrona hosts in WoW in FFXIV. They involve choreographed group dances composed of simple, short emote animations according to the dance master’s directions.
If having the dance master shout directions IC feels too immersion-breaking, perhaps they could be made in raid chat for those willing participate.
Here’s the most recent one, with screenshots!