diff --git a/_plugins/contributors.rb b/_plugins/contributors.rb
index e19e9d87..8a8f8872 100644
--- a/_plugins/contributors.rb
+++ b/_plugins/contributors.rb
@@ -78,17 +78,19 @@ module Jekyll
 
     def generate(site)
       # Set site.contributors global variables for liquid/jekyll
-      class << site
-        attr_accessor :corecontributors
-        attr_accessor :sitecontributors
-        alias contrib_site_payload site_payload
-        def site_payload
-          h = contrib_site_payload
-          payload = h["site"]
-          payload["corecontributors"] = self.corecontributors
-          payload["sitecontributors"] = self.sitecontributors
-          h["site"] = payload
-          h
+      if ! site.respond_to?('corecontributors')
+        class << site
+          attr_accessor :corecontributors
+          attr_accessor :sitecontributors
+          alias contrib_site_payload site_payload
+          def site_payload
+            h = contrib_site_payload
+            payload = h["site"]
+            payload["corecontributors"] = self.corecontributors
+            payload["sitecontributors"] = self.sitecontributors
+            h["site"] = payload
+            h
+          end
         end
       end
 
diff --git a/_plugins/events.rb b/_plugins/events.rb
index 8ef8ed3b..77427094 100644
--- a/_plugins/events.rb
+++ b/_plugins/events.rb
@@ -42,15 +42,17 @@ module Jekyll
 
     def generate(site)
       # Set site.meetups and site.conferences global variables for liquid/jekyll
-      class << site
-        attr_accessor :conferences
-        alias event_site_payload site_payload
-        def site_payload
-          h = event_site_payload
-          payload = h["site"]
-          payload["conferences"] = self.conferences
-          h["site"] = payload
-          h
+      if ! site.respond_to?('conferences')
+        class << site
+          attr_accessor :meetups, :conferences
+          alias event_site_payload site_payload
+          def site_payload
+            h = event_site_payload
+            payload = h["site"]
+            payload["conferences"] = self.conferences
+            h["site"] = payload
+            h
+          end
         end
       end