I am building a mobile application where the user will have a profile with a calendar and manage it. The user can create an event on the calendar from the application.The user can link their facebook page and other social media.

Want I want to do is to integrate their Facebook calendar when they link their profile with their calendar on the application. For example, if a user creates an event on facebook it automatically appears on the application. Is there a solution for this? How can this be done?

Can I outsource this? Or do I need to do it in-house?

P.S. the backend for the app is node.js and the front end is react native.