I'm really sorry, Zamas. I've had those crying spells in various places, too. I not only had to go through the first year stuff, I still am going through going to places by myself where we used to go. They can't be avoided forever.
I don't know if this will help anyone, but here's my take on these holidays or markers of time.
All weekend I geared myself up for spending time with my father. While I did help DD purchase some inexpensive gifts (gift cards) for Perv, I did not dwell on them. I did not prepare in any way or sign them but let her. While she got her stuff ready, I did some prep for my own father and centered my thoughts on him.
I struggle with getting along with him as he is authoritarian to this day (I am 40 and still called "little girl"!), but I spent the afternoon and indulged him. I just sat and listened and let him drone on with things I have heard for my whole life and normally am tired of.
I got him a large hanging annual mix of plants as he is working on making a patio and he can hang it there. I chose lots of red because when he goes to the cemetery on memorial day he chooses red annuals for his own father and I told him that idea. While in the other room setting the table, I heard him share the idea with his GF and heard him exclaiming over the plant and for a short time, my heart was warm and able to forget the rest of my life.
What dawned on me overnight on Father's Day Eve is that it's not about our spouses, it's about our parents. I spent the last year of occasions in mourning and don't want to anymore.
Mother's Day was excrutiating as I hadn't had that light bulb yet, but we did mother/daughter things and that's where I put my thoughts. It really helped not let him ruin more of our time and to let some of his influence be removed.
If we are people who no longer have our father in our lives, there are other things we can do. We can go down memory lane with photos and such or if that's too hard, maybe volunteer somewhere at a shelter where other people may be alone, too.
It really helped me to see how much of life I had made about the man who turned out to be so rotten.