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 calendar inside a modal, or perform manipulating the calendar events such as adding or editing events in the device's calendar.
This is a companion discussion topic for the original entry at https://blog.crowdbotics.com/p/03a1b8b3-2e37-47e1-b869-ec5565dcbf51/