First of all, have fun!
I have been to satRday and the useR in brussels and I was there to make fun, I talked to some people I admired and they were really nice! I was pretty flexible in what talks I would attend, sometimes it was just too busy so I walked out of the talk and took the time to start some side projects, some with people I just met. It is a bit rude to walk out of a talk but sometimes the speakers didn’t seem to realize they were just reading out their slides and that is not what I want to listen to.
I would recommend taking notes of the presentations, I also took notes of who I met and how I could find them.
It is a bit weird to ask at first, but if you don’t ask people for their twitter or github handle or website or something they can be really hard to find!
It is also a bit weird to talk to completely strangers on a conference but it most of the people don’t mind and were very open. (a trick I saw and consequently copied was: when talking to others, leave the group a bit open to one side so others can join in)
I think conferences are great for getting inspired, so quickly making notes of inspiration in a separate page is a great idea, also try to revisit those ideas the same day, working them out a bit to make sure you don’t forget what it was about. And at the same time accept that you will end up not using some or most of those ideas.