I've read the term A season but haven't really found it applies to me as I am dealing with the betrayal of a five year LTA. I found certain dates during the first and second year were difficult but as time has gone on, the pain has eased and the significance of those dates have faded.
Everyone is different, but my H worked hard to help me in any way possible to deal with days that were tough. The first Thanksgiving after Dday is one I really don't remember and since then we have gone away for Thanksgiving breaking the hurtful memory and creating new ones in fun places full of good times toether. Our 29th anniversary was weeks after Dday...we didn't celebrate, but recently we had a outstanding celebration for our 32nd.
At first every holiday, every photo of a specific memory with our kids brought back the "he was with her" or " he left me alone that weekend to be with OW".
I worked at not focusing on those thoughts and H worked to help me. Truly as time goes on, it gets easier to keep my eye on all the good in our life together instead of the bad.
For almost 40 years we have been together and although the betrayal, for me, is the worst thing H has done, we both have our memories of times that weren't so great. The good does outweigh the bad though and the more we work at a life that is good together, the more good times we have to look back on.
I wouldn't get hung on on a season but instead focus on the days that are important to you and let your WS know what you need to get through them.
It takes time, but it is so worth it when you both work together.