Add a note for those wondering how to get their conference listed here

conferences/index.php

@@ -7,6 +7,12 @@ include_once $_SERVER['DOCUMENT_ROOT'] . '/include/pregen-events.inc';
 
 $layout_workaround = <<< EOT
 <div id="conferencesSidebar">
+    <div id="contact">
+        <p>
+            Are you planning a PHP related conference and want it listed here?
+            <a href="/contact">Let us know.</a>
+        </p>
+    </div>
     $RSIDEBAR_DATA
 </div>
 EOT;