I had three model shoots booked for this coming weekend but I have had to cancel one of them as I need to work on Sunday. I have been lucky over the last few months in that I have felt the need to do only the odd few hours work but this time I have been asked specifically to do a particular bit of work to help some others out. Feels different when it is not optional (well it is, but not really). It does need to get done. I get well paid and it is not much to ask from time to time.
I suspect my family will not be so happy but such is life.