On my iphone 5, after updating to ios7, my calendar app is not syncing with my wife's 4s, unless I add a new event. Only after I create a new event to the calendar, it suddenly downloads everything that my wife put into hers. Before we updated to ios7, it automatically updated our calendars within 1/2 hour of anythign being added or changed. She is not having this issue on her 4S, hers updates immediately any time I make changes from my end.
We really depend on this app to keep track of work days, appts, etc, so any help would be great!