If you have multiple calendars:
1.Click the button to the right of the calendar name in the top line of the event creation window. A list of available calendars will open..
2.Select the calendar in which you need to create a new event:

Creating an event on behalf of another person
If you have access to calendars of other users with editing rights, you can create an event on behalf of another person.
Do the following:
1.Click the button to the right of the calendar name in the top line of the event creation window.
2.Select from the list the user calendar in which you need to create an event.
Notifications to participants' email addresses will be sent on behalf of the event organizer—the calendar owner. If you specify yourself as participant events, you will also receive an email invitation to the event.