Setting a profile in separate calendars allows you to distinguish yourself between different calendars. 

For example, you could choose "Mom" as your name in your family calendar, and your real name in your work calendar. 

How to set your profile in separate calendars: 

1. Tap the three horizontal lines  in the top left hand corner of the screen
2. Select calendar you wish to set profile in 
3. Tap "More" in the bottom left hand corner of the screen
4. Tap the gear in the top right hand corner of the screen
5. Tap user settings
6. Set "Calendar profile settings" to on. 
7. Tap "Untitled" below "Calendar profile settings" and edit profile
8. Finally, tap the check mark ✓ to finalize your changes