Dear Diary...
...last weekend we attended a liberal-progressive tango marathon.
Compared to an encuentro, there were significantly fewer established couples, and the clothing was more relaxed. Aside from that, it was interesting to see how the rules of attention economy of an established event couldn't be suppressed there either. Most people need to belong to a group, and groups need shared characteristics and codes to differentiate themselves. Of course, not everyone greeted everyone else, let alone danced with everyone else. There was the "we've been here ten times" clique, the "we're from the capital" clique, and the "we dance very progressively" clique. Double-role dancing was normal, at a gender ratio of 3:2 also advantageous, and some women were excellent leaders.
Overall, everything was quite relaxed - if you were experienced; I hardly noticed any beginners.