They also bring, of course this was pre covid, a couple on board in Lima to teach the tango and they stay on until Buenos Aires, which is a great experience..
The billboard on board is across from the casino, if there is only one piano player playing there, that's your chance to dance, dance floor or not, just request a classic.
If you go to Hal's protocols and punch in your booking nr., first and last name, it will show you the requirements. I am going there too in a few weeks and it says no vax required.