My heart goes out to you...........
All I would say is to try and think how you will feel in a couple of months time if you don't go. If you are secure in the knowledge that you will not regret your decision not to attend, then do what your heart tells you.
I understand that the entire occasion will be overwhelming and I, too, find times like that difficult to deal with. I tried to find a time to go somewhere quiet, away from the distress and tears of other, and think calmly about the situation.......If I went what was the worst thing that could happen ? If you name your ghost it's no longer as frightening.......
If I didn't go what would the fall-out from that decision be ? Which would be the worst to endure ?
You don't know me but please believe that I am sending you my very best thoughts and wishes for you to find comfort and peace at this awful time.........