That national anthem was bad.

[Bluenorthwest]

10. I refuse to judge anyone performing anything at these large, outdoor political events

because a harder gig is impossible to imagine. The professionals almost always play to sync because instruments don't hold a tune, the entire set up is for speakers not musicians, and face it, the emotional weight of the moment can be a challenge to endure. I said the same thing when Beyoncé sang to tape. I would too.
And since you are telling us about your training, let me ask you about your largest outdoor crowd. How large was it and what did you sing and what accompanied you?