What do you pack to keep yourself entertained if you know you're going to be waiting for an unspecified period of time? Personally, I used to tuck a couple of paperback books in my purse. Usually, books that didn't require much concentration to focus on reading, and books I could abandon in place to lighten my load when I was done with them - and an added bonus of perhaps amusing a fellow wait-er who hadn't packed enough to keep them busy.
Now? I have a powerful computing device at hand that packs hundreds of books along but fits in my pocket. Being me, I'll also likely take art supplies in the form of a small pencil case and a notebook not much larger than my hand. I'd pack my full art bag, but it's... not small and convenient. I'll also make sure I have spare battery power for my phone/tablet in case this waiting session runs much, much longer than I anticipate. Because that's what happens with these things, I've learned.
I have a tendency to over-pack - I don't like being bored. I also don't have the ability to focus well when under stress, and being in a place surrounded by random people is, well, stressful. So in spite of having a keyboard to use on my tablet, I don't anticipate writing much at all today.
It may be a long fidgety day.