Yeah, my advice based on the past couple of years is to not over-plan or over-burden your day time schedule. I’ve found that if you show up 10 mins before most talks, it’s not a problem to get in. YMMV, depending on the person speaking and the size of the room they’re in, however. But I also find I end up just sort of “going with the flow” through the conference depending on how I’m feeling, what talks I’ve heard other people talking about, and where I want to be next.
I guess that goes for the nighttime schedule as well, to be honest. I definitely have a list of highlighted shows, but I’ve also been pleasantly surprised by things that I hadn’t planned on attending ahead of time.