Anniversaries are usually handled with each different person. In my first couple of relationships, we would always celebrate each month as it passed. It all depends on the combination, I suppose. Every different special even has to be treated in it's own way. To that, all I have to say is good luck to you.
Relationships are very complicated and silly situations in general.
A good rule to think about is that communication must remain open. If something bothers you, tell her about it. More likely than not, she'll be happy to get the positive criticism. We all want to be the perfect girlfriend, and if you don't give much guidance, we don't know where to go. Same goes the other way around though.