‘Good Tango’ is very subjective. Because your idea of ‘good’ and someone else’s idea of ‘good’ are based on their experience, and a built (or created) appreciation for what you’ve been taught.
All Night Milonga ?
Yes you read that correctly. There are places in the world where a Milonga does (theoretically) go ‘All Night’. The idea is very romantic, that you’re dancing until the sun comes up. ’Theoretically’ ? Because ‘all night’ has different meanings in different places. If, however, we’re talking about Buenos Aires, there are 3 Milongas that do in fact go all night long 1.) La Viruta (on the weekends), 2.) Salon Canning on Monday nights (usually until about 5 am ish), and 3.) El Yeite (Pron: Shay-tay). There are others that go ‘late’ to 4 am, but not necessarily until the sun comes up.