You know what I forgot to mention about the Lou Harrison centenary concert?
Pianist Sarah Cahill's iPad failed on her, twice. This was the one she was trying to read her piano part from, so it was kind of vital. She provided commentary on this: it had just been charged, it was on 99%, and it still died.
Fortunately the violinist also had the piano score, so Cahill borrowed that.
Lesson: Put not your faith in technology. Especially if you're playing the low-tech work of Lou Harrison.