Thanks for the comments.
In the end I went, mainly because my son REALLY wanted to go and play in pool and it would have hard on him not to go. It was just me and my son, their son, one of thier grandsons (my son's friend), and pioneer from another congregation (a friend of thier son). Nugget and my daughter didn't go as my daughter is rehearsing for a show.
Most of the conversation revolved around cars (he's just bought a used Boxster and I have bought a used E class Merc - so we compared notes for about 40 mins). We drank some beers and TBH it was quite enjoyable.
There was very little talk of JW issues and no questions asked about my complete non attendance since March, it was the elephant in the room syndrome. I stayed 1 1/2 and made my excuses.
I suspect as the CO is due soon, and he is offcialy my group overseer, he can honestly say he has made an effort to understand my situation.