No use in complain about the times as people signed up and registered these photoshoots to run them at X time and location, have them listed on the guide and take responsibility for running them. (which was seem hard to do this this fro people to sign up. lol)
You're more then welcome to set one up on the days you want as well if you don't like the days.
If you don't see it make one which is what I did for Sailormoon.
Just a note last year we only had 1 Madoka shoot on the Sunday and you still heard people in the crowds compiling it wasn't on Saturday. But this year the people running the shoots picked the days by popular demand.
Personally I don't attend many photoshoots simple because my cosplays are about 50:50 between popular series/franchise and not so popular ones.
So some years I only do 1 or two photoshoots groups for An an usually only 1 for FanExpo.
Probably none this year for FanExpo again, like last year (the Disney one fell through) but I'm ok with that.