We bring all the food we need for the weekend, leave the bathroom light on in the room, use stairs (which is easy at a four story tall hotel), either get a non-electronic key or have a non-Jew let us into the room, and otherwise not do the things we don't do otherwise with computers and lights and so on. Since the panels are small, we don't have to worry about using microphones (though not everyone says that's even a problem).

We do lose out on some of the things we'd have at home like hot meals and attending services (though we did manage to have services a few times in the past when more Orthodox friends attended). But we manage to keep the Sabbath and enjoy the con. It helps that the con is in a hotel and that we don't have to travel and so on. (We could never go to the NYCC, for instance, because it's in a convention center.)

And I have this odd sense that Bing once asked me this, too.