I always love watching this sort of thing when I'm abroad in Europe. We have a local town band which is multi-generational and I believe the local drama groups attract a wide range of people of different ages. Probably because of the weather, we don't tend to see this sort of thing quite so frequently outdoors. It does seem to be a shame that the generations don't get together quite as much as in other places.
@peterlee I'm sure they do, but that's can be true of, say, playing together in an orchestra/band. All the most noted engineers had brilliant imaginations as well as theoretical knowledge of forces learned through maths and physics.