Create event factory, and required association factories

spec/factories/rooms.rb

@@ -1,8 +1,13 @@
+# Read about factories at https://github.com/thoughtbot/factory_girl
 FactoryGirl.define do
   factory :room do
     name 'Example Room'
     size 4
     conference
-  end
 
-end
+    factory :room_for_100 do
+      name 'Room for 100'
+      size 100
+    end
+  end
+end