Long answer:
2008 I already felt there was no love and had doubts but it was the memorial so... A friend also struggling with depression and other stuff wanted to go to it but not ours so we went to the Spanish speaking one.
In a foreign language it all suddenly seemed a bit ridiculous and pointless watching complete strangers passing plates and goblets up and down the rows with no one having any.
I might have been to a few meetings inbetween I'm not sure but a year later and back in UK attending another memorial I was expecting to feel all warm and fuzzy now I was "back home" but I felt uncomfortable and like I didn't belong. That was my last ever meeting and still no-one has asked if I am ok or why I don't go any more. Zero contact from any of my so called brothers and sisters in almost 10 years now.
Short answer: 2009 memorial