Adding an administrator or member to your account allows multiple people to add and edit information on the same calendar. 

To add a new person, go to Organization Settings in the top right dropdown menu. 

Click on the Members tab at the top. Choose whether you want to add the new member as an administrator or member, then enter their email address. They will be sent an invitation to join the organization, and once accepted they can begin adding and editing events.
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Administrator
An Administrator can add and edit their events, and also edit the entries of others.  
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Member
A member can add and edit the event information that they have entered, but they cannot make changes to others' entries.