I've been celebrating Christmas with her since 2012, pic related is the first photo I took.
I've tried to celebrate Valentine's Day with her in the past two years but I haven't been able to yet. With any luck we'll do it this year without a hitch.
I celebrated her birthday for the first time last year, since I decided to set a date for it.
Aside from that, I did surprise her with buying a giant chocolate egg for her for Easter last year.