Did you consider planting strong-voiced song-leaders in evenly-spaced locations among the crowd? This comes so prominently to mind as the one obvious solution remedy that I'm wondering where I'm going wrong, like it's clearly not possible for some reason or etc. But yeah that sound of someone near me singing, in my experience is the key to granting "permission" for me to sing

This is a great list, thank you.

As someone lately looking for all the dakka to overcome a nagging cough, I came across #13 "make it easier in other ways" from an angle I found particularly useful; namely, by thinking of it as a third feedback source under #11: my body.

After trying to "control" this cough by all manner of hacks Reddit had to offer, and learning that reportedly not even ICU nurses can reliably control such a seemingly simple and universal thing, I came to the conclusion that if body want to cough, body will cough. Therefore I might need to pay more attention to wacky ideas that bubble up in the back of my head on how to feel good, than on what "should" feel good or fix it. 

Jury's out on whether the ensuing bizarre hot-shower-ritualistic-act is really why I'm currently coughing much less, but it definitely didn't hurt (more than I can say for some of my previous remedy-attempts).