I would be kindly blunt about the scheduling. If it were me, I'd say something like, "Can I ask you something? Would it be possible to change the day of our session by any chance? I end up feeling anxious about whether or not I can depend on a Friday session because sometimes you need you reschedule and I was wondering if there was a way around this?"

Then for the scrap-booking thing, I'd ask if I could share something that I was looking forward to sharing last week, but didn't.

I find a lot of the time, if you're kind and ask, it makes it hard for someone to tell you no and/or it kills any sense of defensiveness from occurring and spinning the session into frustration.