--- a/project/scipycon/base/models.py	Wed Nov 03 00:58:47 2010 +0530
+++ b/project/scipycon/base/models.py	Wed Nov 17 23:25:09 2010 +0530
@@ -75,3 +75,7 @@
 
     class Meta:
         abstract = True
+
+
+class Paid(models.Model):
+    event_start = models.DateTimeField(blank=True, null=True)