Well, in looking for things to do on my visit to Portland, OR this weekend, besides Andrew Calhoun on Sat., I see that this is the Sunday for the big OR Gymanfa Ganu - for all the Welsh (and other) hymn singers.   
http://wapnw.org/brynseion.htm
I hope to make it. Anybody going? Also hope to get to the slow bluegrass jam on Saturday pm, unless the grand-daughter wears out first!!
Hwyl, Chris