Check out the following steps to change the color of your Calendar events.
- Tap + to create a new event.
- Tap the color icon on the next screen

- Tap the color you’d like to use for this event. You may also set this color as your Calendar’s default color by tapping Set to default calendar color.

- After editing all the necessary details of your event, tap the check icon to save and exit. Your chosen color is now reflected as a colored bar on your Calendar’s monthly view and within the event screen.

Note: You can only sync the color of events created via a Google account.