My ex works shifts which are in no set pattern. Each month he sends me the dates that he wants to have our DD6.
I should also probably mention that me and the ex aren't very amicable which is down to him.
Most recent contact DD was due to stay at ex's Wed and Thurs night. A few weeks before one of DD's friends asked for a play date that ended up being on the Thurs (this was the only date all the other parents could do).
I asked 2 weeks before hand whether ex would mind swapping the Wed and Thurs to Tues and Wed instead. He agreed, no problem. A few days before said contact, ex cancelled the Tues as 'something had come up', so rather than make up another day, he just had DD on the Wed.
DD told him about the play date and I got a barrage of abuse about how I shouldn't be cancelling contact with him for play dates (even though he agreed to swap and then cancelled the new day).
He has gone on about it so much that I'm starting to think I was unreasonable. I'd be interested to hear what other people think!