Wesley doesn't eat whenever we are doing something out of the ordinary. I give him more healthy treats throughout the day so at least he's eating something.
I do think the busy week probably threw Izzy off. I don't think you need to change his food if he hasn't had trouble with it in the past. If you are worried about him not getting enough to eat, you could maybe mix in a little wet food with his hard to coax him to eat more, then just give less and less wet till he is back to only dry. I'm sure when things calm down again, he'll be back to normal. Good luck!