We have a day/weekend to move next month. DH cannot take any time off work, so that is the only time we have. He told me (as he left the country for ten days) that he had a social thing on a day in November, but could not remember which day 
. It would mean him being out from 8.30 am until at least 5, and possibly 9 or 10 if he stayed for the whole thing.
Then phoned from the airport (wuss) to say it was the same day we are moving. Clearly he knew this already! He seems to think that he can do both. He says that his folks will help us etc.
I didn't want to get into a big barney as he was going away - it would fester for the whole time away which would not be healthy for either of us.
So, AIBU to expect him to cancel (he cannot postpone it)? It is at no cost to him, but he would be letting a friend down, sort of, but it's a big gang, so not as if the whole event is reliant on DH's presence. If he cancels now, then the friend has time to get a replacement.
I don't care whether or not his folks will help (but I know they will) the point is, that our family, DH's family, are moving house. We aren't going far, but we still have to move all our stuff and set up a new home inside two days.
BTW I love DH, am not seeking a way to piss him off or upset him, and do not begrudge him his own time off doing things. But in this particular instance, I am kind of upset that he didn't straight away "I'll call mate and cancel".
AIBU? I am genuinely interested in hearing a range of views.