Attended: Successful Sprint Retrospectives: Styles, Ideas & Tips
Simon Reindl hosted a briljant Meetup at Xebia. Using Liberation stuctures he got us, 80+ Agilist, from the worst retro ever to what are you going to change now. Each member has a pair to reach in four weeks to discuss the results so far.
My personal take away: Listen better, feel the vibe, be aware of personal conflicts.
See the overall impression below.