When traveling to a convention like Star Wars Celebration V in Orlando, you will definitely want to make sure you have your chargers, memory card readers, laptop, extra hard drives, etc. However, do you really need all of that stuff with you while you are on the show floor?
Carry only what you know you will need and actually use at the show...The camera, the lenses you will actually use, the flash, extra batteries & memory cards, and a lens cleaning cloth/kit. You shouldn't need much more.
Sure, your macro lens and big tripod are really great. But do you need them at this show? This will be a good chance for you to try to get the photos you want withOUT carrying every piece of equipment you own. It will also allow you to leave room in the bag for the goodies you plan on getting at the show!