I hear you on the special days are stressful. In my experience, we can keep them relatively 'blow-up free' when I focus on low key, but meaningful activities for us to do. Something that's not too stressful, but special. Our last anniversary, I cooked him a meal that is one of my grandmother's recipes. It's a *lot* of work so I don't cook it often, but he loves it and so a relatively simple thing (I mean, at the end of the day we ate a meal in the kitchen
) became a rather grand gesture.
I also really love naguma's idea of doing multiple things spread across a couple of days, going to remember that for myself
Good luck! And hopefully things will turn out good and you get to spend your anniversary enjoying each others' company