adding contributor summit feedback

events/events-team/feedback.md

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+We have been collecting feedback in some shape or form since we started doing
+Contributor Summits (fka Developer Summits) from both attendees as well as our
+awesome set of volunteers. The feedback is an integral part of our content
+creation and overall experience of the event. This doc captures these for
+historical and future planning purposes.
+
+Thanks to all who have provided feedback in the past.
+
+####
+[2016 feedback]  
+
+#### Austin  
+[2017 feedback]  
+
+#### Copenhagen  
+[2018 EU feedback]    
+[2018 EU retro]  
+
+#### Shanghai  
+TODO  
+
+#### Seattle  
+[2018 feedback]  
+[2018 retro]  
+
+#### Barcelona  
+TODO  
+
+
+
+[2016 feedback]: https://docs.google.com/spreadsheets/d/1W443ToSJGvk5O2ah1bOC6OUM4F7zsBoJRtq2qbLC36E/edit?usp=sharing
+[2017 feedback]: https://docs.google.com/spreadsheets/d/1NNfd4O4mcwGaJJuw1QS9PUEBF08u2QlaW54t5IuJEFc/edit?usp=sharing
+[2018 EU feedback]: https://docs.google.com/spreadsheets/d/1Bev8BthgC5OBtak5BDR23lG2eYs3b8UEngoewDyEsnc/edit?usp=sharing
+[2018 EU retro]: https://docs.google.com/document/d/1XyjCDFiEx06TkD4vDkci00h0uZR9OVNnKd6MxVo_bAo/edit
+[2018 feedback]: https://docs.google.com/spreadsheets/d/1VXwAYo8sJQk1amrayUaYRN5Ly5cYi-t2Yw355veRcDs/edit?usp=sharing
+[2018 retro]: https://docs.google.com/document/d/1lonVMIO15xZoxZtX5Gr5N-Wb5GtDY5lGnjKgrfNEAyU/edit?usp=sharing&urp=gmail_link