East Coast ReprRap Festival
Usually takes place September
Midwest RepRap Festival
https://www.facebook.com/midwestreprapfest/
Usually takes place in June
Rocky Mountain RepRap Festival
https://rockymountainreprapfestival.com/
May 17-18
Sanjay Mortimer Reprap Festival
https://e3d-online.us12.list-manage.com/subscribe?u=85f2d4fa6f57c6eb9ae8e8fd4&id=aeaa8ddd08
Usually takes place in December
Ukraine ReprRap Festival
https://www.facebook.com/events/732794651809828/