Accessing device calendars in a React Native app can be a bit tricky. Using open-source modules like react-native-add-calendar-event can be a great help when you are looking to show a calendar inside a modal or manipulate calendar events, such as by adding or editing events in the device's calendar.
This is a companion discussion topic for the original entry at https://blog.crowdbotics.com/how-to-integrate-custom-calendar-event-creation-in-react-native-crowdbotics-app/