We have found people do both. We have used our own journals for a few cons, but they are getting full so we've moved on to another one. I would think for a really big event, you would want to dedicate one journal to it. But for smaller to mid-size shows, you could collect stuff from each event. You could even make a journal just around a particular fandom, like if you go to shows with a lot of Walking Dead actors, you could make a Walking Dead journal with their autographs and some of the great original artwork in artist alley and the vendor. So really, it's entirely flexible on how you want to use it!