Create two gmail accounts to work in a google calendar.

I was instructed to create two gmail accounts that both have access to a google calendar. I have created my account but must create another gmail with full access to the calendar and supply the other I was instructed to create two gmail accounts that both have access to a google calendar. I have created my account but must create another gmail with full access to the calendar and supply the other party with the email and password of the second email. In addition they must have access to the calendar.