Let's get serious about linting, folks.

app/helpers/conference_helper.rb

@@ -0,0 +1,18 @@
+module ConferenceHelper
+  # Return true if only call_for_papers or call_for_tracks is open
+  def one_call_open(conference)
+    conference.call_for_events.try(:open?) ^
+      conference.call_for_tracks.try(:open?)
+  end
+
+  # URL for sponsorship emails
+  def sponsorship_mailto(conference)
+    [
+      'mailto:',
+      conference.contact.sponsor_email,
+      '?subject=',
+      url_encode(conference.short_title),
+      '%20Sponsorship'
+    ].join
+  end
+end