It was at a Plone Symposium East at Penn State that I was introduced to git by @claytron. The sprint meister was @smcmahon @esteele @davisagli @robzonenet @cewing @vangheem were present. Probably 2010…?
Now I feel old 
— since I started using Plone, I have run my projects through all of cvs, svn (circa Plone 2.5), bzr on launchpad (because until about 2012 I perceived that it seemed easier to grok than git), and git. I like git much better than any of those systems, but it took some time to develop that affinity.
I remember learning about git from Rok Garbas at the CMSUI sprint in Bristol in 2011. Everyone at the sprint was working on the same repository and it was quite a revelation to have everyone be working on their own branch but still be able to merge in changes from a different branch on demand.
That was also the sprint where Nathan or I plugged the wrong US power adapter into a power strip and tripped the circuit providing power to Netsight's server room. And where I found a security hole in Zope traversal which I demonstrated by making Matthew Wilkes' laptop start talking.
Americans: causing international mayhem, since ... 