I'm usually as bored of light lagers as I am of the industrial beers they offer at events with large crowds. Still, beer with music is better than no beer, and I might smuggle some of these light beers in with me. ;)

You're right, I'm also disappointed with the beer offer at these mass events, but some bands do offer their own beers, I mean in the sense that someone brews them for them, Bewog brewery brewed one such ale for one Slovenian band, a very good one, [Siddharta]

And the beer is better than industrial.
Bewog - Ledena
https://ecency.com/hive-187719/@seckorama/beer-tasting-ledena-sunset-and

But this one here, it's better, so I believe it's moving in right direction.