Hi April, after installing eM client, just skip the initial account setup and do not setup any account.
When the application loads go to Tools > Settings > General, and check the option to “Show local folders”.
This should display a Local folder item on the list in the left sidebar. Switch to the calendar view and right click this item, or select one of the calendars to start using your local calendar.
If you want to use the application for calendars only you can also hide all the other tabs from the sidebar by right clicking them and unchecking the option to show the selected.
Hope this helps, let me know if you need more help with the setup.
Regards,
Paul.