For me, for example, visiting Miami was very motivating. It gave me more energy to build. In Prague I expect it to be similar, but even more intense. Today I know a lot more people and projects. For me the biggest value is to go through the expo and try to talk to as many people as possible. Ideally, you should also have thought out in advance who you want to talk to.

I would ignore the discussion panels completely and give a small priority to the talks as well. They are usually available after the event. You have limited energy and I think it's better to focus on the people you can meet. Side events are fine too, but I probably won't have much energy for them anymore. I think it's better to attend meetups as much as possible during the year. However, I would like to go to Hack-dev-day → it seems unique to me.