a) that because parents haven't asked me to collect at a later time that I'm not needed today? Children are expected back about 5ish so he won't be there when I collect the others from school.
b) that I should go to collect at the inconvenient time of 5ish because the parents have not told me their child will be absent today? They never get back at the expected time and this will disrupt dinner.
I have emailed/texted parents earlier this week but they haven't replied. I only know about the trip because my son is on it.