Cross-syncing calendars between iPhones

Is there a way to setup a calendar that will display on my iPhone as well as my wife's iPhone simultaneously and sync between the two?

I have court for work quite frequently, at all hours of the day, and need my court calendar to sync with my wife's phone so she knows when she can and cannot make appointments, etc. And also so her appointments will show in my calendar.

I hope there is, any help is appreciated! Thanks!