Users on my site can create content by adding a new node of content type 'project'.
Projects are assigned to exhibitions through a drop down 'exhibition' field which is an entity reference to another content type named 'exhibition'.
Exhibitions are created by admins and each exhibition has a location field (one of three distinct values).
I would like to create a view that displays all users that have created projects for two or more locations. So that could be (for example) 5 projects for 2 exhibitions in location X and 2 projects for 1 exhibition in location Y.
Having some conceptual trouble putting the view together, any help much appreciated.