Obviously. Nothing's Going To Get Done During The, Excessively Long, G7 Summit.

https://www.dailymail.co.uk/tvshowbiz/article-14814479/Capital-Summertime-Ball-technical-difficulties-Lola-Young.html

However I'm pretty sure it was Austria who, a few years back, were represented at Eurovision by a part-time theatre dresser/make-up artist.

Not only was it the first time she'd sung before an audience of that size it was the first time she'd sung using ear monitors.

It went about as well as you'd expect.

https://www.youtube.com/watch?v=nGPlnVLWGt8&pp (Capital Radio, The Clash, EP, Official Audio).