A friend of my husband committed suicide three years ago and we had the same feeling about going. But we did and it was a wonderful experience. The minister gave an outstanding talk about the pain involved with not understanding and the sense of 'what could I have done'. And the attendance was huge and we were all their together and sad, and I think we all left with a sense of peace and understanding. It could be cathartic for you.
Dr Sophia Yin ended her life almost two years ago. She was one of the foremost animal behaviorist in the world and I worked with her. We developed a personal rapport and it was so sad when she died. I went to her celebration of life and again felt comfort in that my feelings of loss were not in isolation and that I got to hear so many neat stories of her. I'm really glad I went.
J, I think you should go. I think you will be sad but you will also be surprised by the love that is felt. And it will provide some closure for you. The questions surrounding the suicide will not be answered but your grief and your ability to love in the face of this loss will be nurtured. And finally, better to go and be sad than regret you never went.