Depends on the convention, and I haven't been to a gaming convention since 1991. I had brought only myself (and maybe a pencil), because I didn't have a lot of ability to pack gaming stuff, but I was able to play a Car Wars tournament with all needed materials suppliedby the GM (come from behind win, go me!) and a couple games I don't remember because that night I drank myself into a stupor, one of the five drunkest nights of my life. It was a huge party, and a good time was had by all. Since the late 90's, I don't travel without the laptop, but that's for stuff like email and communicating with people that aren't at the con. I've never had a gaming-associated computer resource other than occasionally pulling up a PDF when gaming on Roll20 or on a gaming MUSH. I understand I'm a bit of a luddite in my electronic presence, but I've never needed more.