This past summer playing a set at a similar looking small festival, I broke my G string on the FIRST strum of a tune in a set which was a mix of guitar, Irish flute and a cappella singing. Luckily I was playing in DADGAD so it was easy to work with the open tuning of the guitar, and mostly play bass notes. However, the set was simply me and a bodhran player, and so having no one to change strings I asked if anyone in the audience could fix a string for me. One woman stepped up, grabbed my guitar, restrung it and even tuned it back into standard tuning which was what I needed for the next song. She handed it to me just as I was announcing that song. Fantastic.

Live music is a great training ground for this, and I love your parsing of your experience here.