Hey welcome WideAwake7. We had a sort of similar situation this year, its was just before me and my husband finally left the org. We were invited to a wedding of one of my childhood friends who my family had known for years, my brother who left in his late teens was also invited as he and the groom had been extremely good friends when they were growing up.
My brother wasn't sure whether to go as the last time he had been in a KH was my own wedding 8 years ago, in the end he decided he should as they had obviously made the effort to include him when most witnesses wouldn't bother. Basically we went and everyone was lovely to him, nobody ignored him and he said he felt very comfortable. The worrying thing though he said was that when he was in the KH he said it felt like the most natural thing in the world for him to be and that it seemed "normal" to be there! This coming for an atheist!
I think people were genuinly pleased to see him as it was our group of old friends but I also think that they were hopeful that this wedding might bring him back. I had made quite clear beforehand to some who mentioned it that it would def not do that, and it didn't! But in general he had a really good time and wasn't made to feel awkward with pressure to return etc. None of them know yet that we have stopped going too now :/ not sure how to deal with that one........
I think as these people are your genuine friends and obviously really want you be at their wedding, I wouldn't worry about what other people think or say, as it's a wedding im sure they will just want things to go smoothly for the bride and groom. I expect you will get "lovebombed" quite heavily but would imagine conversation wont get much deeper than "oh its so lovely to see you, how have you been?" etc. At wedding's even witnesess are more relaxed, especially if alcohol is involved! I find hanging out with any non-JW family that may attend is a good way to ensure you have a good time! We had some on our table who were a real laugh.
Anyway i hope you have a good time and look forward to hearing your story.
FF x