Folk musicians gather for old-time jam sessions in Seoul
Somebody posts on a quiet Facebook group that it's time for another old-time jam session. Usually, there's no more than a week's notice, and at the anointed time and place, a group of musicians versed in various folk traditions come together to make music. There are core participants who show up almost every time, but they're welcoming of newcomers, and each time is a little different.
Source: koreatimes.co.kr