In the Calendar app, events appear according to the time zone of your current location. However, you can set your calendar to always display a specific time zone, even if you travel to a different location. You can also schedule an event in a different time zone from the one currently shown in Calendar.
You can create and edit events in Calendar and change the time zone of the event—even if it’s different from the time zone you’re currently in. For example, if you live in New York, you can create or edit an event and schedule it according to the time zone in another location—like Chicago.
Go to the Calendar app Keep track of events in Calendar on iPadSet up multiple calendars on iPad