Fix dates on tickets page

templates/purchase/tickets.html

@@ -20,7 +20,7 @@
 
 <h4>A ticket to Electromagnetic Field {{event_year}} will get you:</h4>
 <ul>
-    <li>A secure place to camp from Thursday June 2<sup>nd</sup> until Monday June 6<sup>th</sup></li>
+    <li>A secure place to camp from Thursday May 30<sup>th</sup> until Monday June 3<sup>rd</sup></li>
     <li>Very fast internet access, both wired and wireless</li>
     <li>Mains power</li>
     <li>Access to running water, hot showers, a well-stocked bar, and a variety of food vendors</li>