I've never celebrated an anniversary. The only relationship that lasted long enough to even think about it, was with a jahovah's witness. I LOVE giving gifts and celebrating things, so it was awkward trying to figure out how to handle the 1 year/valentine's day thing with someone who's religion doesn't allow for celebrating dates or giving gifts.
Plus, there was the added awkwardness that I had decided to end it as soon as the play we were both in was over. I didn't want to deal with having to spend several hours a day with him right after a break-up. It would have been a completely new level of awkward for us and the rest of the cast.