Hey Josh, it really isn't about what anyone else would do as much as what is good DBing, and what is right for your situation.
I would probably take the card for your anniversary and just say a simple "Happy Anniversary". And then walk away. I never had to face our anniversary in our situation. We were in the beginning of Ring and piecing for our anniversary so I got her a bronze garden statue of her college mascot. Something personal but NOT romantic. I think we did do dinner, but remember we were in Ring and piecing by then.
Valentine's day did fall in the middle of my situation, so I got her a spa day gift certificate for her and my daughter to go spend a day at the spa. Again, personal, but NOT romantic. A simple note accompanied it stating Happy V-day to (my W's name) and (my daughter's name).
For Mother's Day, remember she isn't your mother. SO get her a card and gift from the kids. Do not make it about you and her. Make it about her and the kids.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018