You are right about the Foreign language songs. I knew Skarpi would be there so would hear Icelandic, and expected French and Spanish, and even those songs were from Brazil and Vera Cruz (with the typical quaver); also Italian, an older Slavik language, two different Hebrew rounds, Irish Gaelic (from two different singers; I was going to try one myself but the circle was large and fortunately I passed; two people would have spotted the fluffs), I think a German and I do not recall what else but I know there were more.
Also, who sang the heartstopping werewolf song near the start of the SpookyGrim? What was it? Wow.
And the woman who was not yet familiar with "On Ilkla Moor" was fun to watch; what a treat to see someone hear something good for the first time! I learned it as a simple children's song and the impromptu chorale was amazing.
I never would have thought string bass could sound so good. (Gutbucketeer? I can't say I have either 'Cat or other names down)
Another great moment was when someone at the Foreign Language circle sang a song South American fishermen use to call up the wind, and out of nowhere a brisk breeze sent the trees waving and the barn door slamming.