I called yesterday to ask the same question. The woman was very helpful and informed me that everyone should dress CASUAL on the first day. It is a very casual and comfortable day. Then dress up on the day of the interview!! I'm just a little nervous about this one...I don't want to be the only one dressed casual on the first day. What else is everyone wearing?? What weekend will you be there? I'm there on the 27th and 28th.