Add info about check-in on Friday.

Author: frenzymadness

index.html

@@ -87,6 +87,10 @@ <h2 id="accommodation">Accommodation</h2>
 You can only book accommodation when <a href="https://pretix.eu/pyconcz/pycamp/">buying a ticket</a>.
 </p>
 
+<p>
+<strong>Check-in opens on Friday, September 12th at 14:00.</strong>
+</p>
+
 <h2 id="travel">Travel</h2>
 
 <p>