Galleries, museums, theatre, classical music-the things some parents don't take their kids to unfortunately.
Sadly if you try to run a trip to a concert/theatre, many parents say it’s too expensive then you can’t run the trip because so many people won’t pay and the school doesn’t have a budget to make up the shortfall. If you run a trip somewhere free, but then have to run coaches (which cost hundreds and hundreds now!) then many parents refuse to pay because ‘it’s free and I could take them myself without having to pay £25’ (but then they don’t take them).
Yes, in an ideal world school should have massive budgets to take kids to lovely places, but in an ideal world-they would already be taken by their family. Many schools are more worried about getting a teacher in front of a class, getting enough buckets under leaking ceilings and enough pencils/books for each child. Trips to galleries etc can’t be a priory whilst the learning is so badly affected by budgets.