I may have been a little optimistic yesterday morning; I ended up standing through most of one program item yesterday, today I ended up going to my second or third choice at least three times, and the queuing system for getting into panels has been a nightmare, with enough people in line to fill the halls before the previous panel ends. I hate to say it, but I'm not convinced the convention centre is adequately sized for a Worldcon. It's big, but maybe not big enough, and it doesn't seem to have the unused overflow capacity that they were able to bring into use at e.g. Helsinki. I haven't yet been to the second con site, a few hundred yards away, but so far nothing that interests me has been scheduled there - that may be changed, of course, if they reorganise for more effective use of the space.
Weather has been intermittently wet all day, but I was lucky - it held off during my walks to and from the convention centre, and this evening when I went out for a meal.