If your calendars are not selected to be displayed you may receive an error message that says "It looks like your calendars are disabled".
The solution for that is to go open the MobileDay app and go to menu>Calendar Selection and select the calendar linked with your email address. The events should then show up.
The other possibility is that syncing Calendar events is turned off at the account level on the iPhone. The place to double check that setting is to go to iPhone settings>Mail, Contacts, Calendars and tap on the arrow on the far right of the screen for the account and on the next screen make sure the button on the right next to "Calendars" is green for ON.
If you happen to select a calendar with no events associated with it, you will get an error message that says " It looks like you don't have any events scheduled. Enjoy your time off!" the solution to that is to go back to menu and select a different email account that does have your calendar events associated with it.