on chapter 2: Why are they upset?

They're upset because they want to go and see the hanging;

"'They're disappointed because they couldn't go to see the hanging, that's what it is. I'm too busy to take them. and Tom won't be back from work in time.'

'Why can't we go and see the hanging?' roared the boy in his huge voice.

'Want to see the hanging! Want to see the hanging!' chanted the little girl, still capering round."