By default, every event that you create is scheduled to the time zone of the calendar in which you create the event.
To create an event in a time zone other than the calendar default time zone, perform the following steps:
Create the event by following the steps described in How Do I Create an Event?
Click Time Zone from the New Event tab toolbar.
The Time Zone Settings window appears with a list of all the time zones.
Select the time zone from the drop-down list.
Click Set to set the time zone for the event.