How do I go about getting in to a Marine graduation at Parris Island?

My husband will be graduating from boot camp soon and I would like some advice about going to graduation. First, how do I get into the graduation? What should I wear? What should I expect from my husband? I know that PDA is a big no-no, so I am prepared for that. I am just really excited about going and I don't want to do anything that will screw up "his day." Any advice from Marines, Marine parents and spouses would be apprciated!! Thanks!!