Oh, Inky....if you lived near me I would come over to your house and give you a big hug! I can't imagine the pain you must be going through.
Your son is being very extreme in his view toward you not going to the ceremony. I have known disfellowshipped family members who went to weddings and, right now, I know a young couple who is getting married who have a disfellowshipped sister and she IS invited to the ceremony.
If it was me, I would go anyhow. Damn his rantings.....you are his MOTHER! I would show up and if they would not let me in, there would be fireworks! I look at it this way, he has written you off, so what do you have to lose! Don't go down without a fight, Inky! You might not be able to change him, but at least all those there at the wedding will see that you LOVE your son so much that you wanted to see him married.
Again, I wish there was something tangible that I could do for you..... just know that, even if we don't know you personally, we care.
Mrs. Shakita