^ here's a place to start: http://www.loc.gov/about/faqs.html
When we were looking into visiting, there was a need for a special library card. (you can start the process online so when you go there you just need to deal with the photo and other details) canofhumdinger's did you have to go through that process or because of the 'Star Wars' connection this was all bypassed, since you were meeting with someone specific? and not at the Library but one of it's satellite offices.