This was a pain to get. There are 3 detour side quests for dancing in cepal. In the tavern, talk to pilo and dance. It is a QTE. The 1st one easy, 2nd one fast and 3rd one is lightning speed. The buttons don't change so you'll need to memorize them bc of how fast they are. For the Finale, use the following buttons. There are 24 in total. First 8 are slow, last 16 super speed.
X, TR, SW, CI
TR, X, CI, SQ
CI, SQ, CI, SQ
X, TR, X, TR
SQ, TR, CI, X
CI, X, SQ, TR