Since this has turned into a thread for reminiscence, here's mine.
Sometime about 9 years ago I was casting around to get some advice on repairing my Brompton and happened upon a little forum called ACF. It was a bit odd, but quite inspirational, and encouraged me indirectly to dig out my old Dawes Windsor. Taking that apart it became clear it would never be ridden again, so I looked around and ordered a different Dawes from Edinburgh bicycle. The first time I went out on it I managed about 3 miles before having to stop and go slowly home because I was out of breath. We went out together on our solo bikes, me crawling very slowly up a hill behind Mrs W, but we enjoyed it. Then we went on a holiday to a Landmark Trust place in Lincolnshire, loved it, and started talking (again) about tandems.
Meanwhile, back on ACF, some charismatic lunatic called Simon L3-and-a-half (or something like that) was going on about his night rides, and had a Guardian article published about them. I was captivated. They were far too long for me, and I wasn't entirely sure I wanted to meet someone from a forum in real life - it was enough just feeling that I had some virtual connection with them. But when we got our first tandem in about 2008 I specced it with a hub dynamo specifically so that we had a piece of kit fit for an overnight ride.
Fast forward to 2010 and I signed us up for a Brighton ride as prep for our cross-France tour. Simon did his best to dissuade us from riding tandem, but in the end it was simple overwork and undersleep that made us drop out. Taking advantage of R's absence staying with her mum, one day in 2011 I signed up for a solo Brighton jaunt. By that stage I'd developed an online rapport with a few Fridays, but very deliberately kept stumm about having signed up. It was August, but a very cold August, and the half-way stop was very slow - and some young thing called Andy was riding a BMX. I didn't quite know what to make of it, but was enjoying myself enough to say hello to TC and Adrian. She invited me for a beer - drinking over breakfast was surreal - but I do remember waxing very lyrical over a Thai meal that evening before falling fast asleep.
Then we signed up for LonJoG, I took Greg Collins over a bumpy road that spilt him off his fixie, R joined me on a very wet Brighton ride where we got to the top of Ditchling and were met by a wall of rain and wind (but again, she loved it), and the rest is history.
I don't know whether Simon did it consciously (probably not - he's focussed most on the here-and-now, the immediate response), but the last few years have been (as much as anything) a training ground for the long term for future ride organisers and leaders. The Fridays will continue, in some form or another, and I hope to be part of that.