> utterly indistinguishable to me

Utterly?

While somewhat harder, it looks like one is a protest and one is a photo of people dancing at an music event. Please don't take photos of people just enjoying themself (in Germany). Most people change their behavior when a camera is pointed at them.

Lukely some clubs have strict "no photo" rules and put little stickers on your phone camera. Can't do that in a street festival though.