Dealing with Triggers of Father's Day After Losing My Dad

I'm mostly putting this here to vent but anyone who dealt with similar is welcome to offer advice. I lost my father a couple years back and it's been very traumatic for me. Almost as if by instinct around important dates I start getting Ptsd triggers. They usually aren't strong enough to bother me but they come and go in waves sorta speak. It's almost fathers day and sometimes thinking about it I'm put right back into the emotions of the day it all happened. I hope this paragraph made some sort of sense