Collecting PREP TIPS for YALC

I remember, last year, when I was jealous of everyone preparing for YALC, gushing about it everywhere and I was at home, at work - anywhere but in London. This year is different though! I got my ticket, booked my train and my hotel and am in full-on prep mode! I've looked up some posts and decided to combine all the interesting tips I could find. Because if you're going, or maybe someday going to a book convention, you might need these as well!