> If you—the proverbial you and not individual you—go to the beach for an all-day outdoor music festival and didn't pack sunscreen or bring an umbrella or tent and can't find any shade to stand under, yeah, you're gonna get a pretty bad sunburn and/or heat stroke. Both of those things are typically preventable with the right planning.

> There are plenty of stories of people getting seriously ill, injured, or dying from being exposed to the elements and not having appropriate clothing.

You'll be a great dad someday if you're not already - but in this case, they didn't pay for an outdoor experience. They paid for an indoor experience with the implied promise of a reasonable line, which they dressed for. Nobody brings coats and umbrellas to clubs like that when its just sprinkling, because it sucks to have to deal with them inside when it's 90deg and packed with people dancing, and they're likely to get ruined/lost/stolen anyway. OP did exactly what club-going adults have been doing for decades. It's an international standard.