kelsey, I don't see why you shouldn't. There were quite a number of applicants that had boyfriend/girlfriend/engaged, spouses etc... on my day. I think they want you to have someone with you, as long as you want that person there.
I know from talking to some of the 4th years that they used to not a limit on the number of guests, but they changed it to two after some people brought their entire family along with them. Mom, dad, brother, sister and grandma and grandpa. I can't believe someone actually did that, but I guess it happened several times.One guy said that there was one girl that had brought 8 guests with her. I wonder if she got accepted and if she didn't', I wonder if she received a bill for lunch.