Petra Gerritsen goes to a concert almost every night off. 'You're with your own group. But how bad is that?'

'I work five nights a week and so I have to find out specifically when I can go to a concert. Sometimes I take time off for it. And then they do say, "hey, are you going to a concert again already?", and I say, "of course I'm going to a concert again". But I don't think it's extreme either.' Petra Gerritsen is a process expert at PostNL and very regularly visits a concert in TivoliVredenburg. 'I go once a week on average, sometimes three times. Since a year and a half, I've been working five evenings a week. Before that ...