Some iPhone users have subscribed to the Google Calendar and it doesn't show up on their iPhone's native calendar app.  There's a fix for this.  
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Go to the following link to view a list of your calendars and calendar subscriptions. 
https://calendar.google.com/calendar/iphoneselect?pli=1
Scroll down and make sure the box beside "sewaneeconf" is ticked.
 
Now, after clicking your heels together three times, go to your iPhone and click on your calendar app.
Click red "Calendars"  at bottom.  

Scroll down your calendar list and make sure there is a checkmark beside "sewaneeconf" calendar.

If this doesn't work, find yourself an amiable Young Person at the conference, hand them your device and say to them innocently, "Here.  Make my phone show me the conference calendar.  And while you're at it, please fix this problem I'm having with my email/text message/phone volume/ringtones."