I’m really sorry to see this, Cody.
While Event Tickets is explicitly designed to work out-of-the-box without The Events Calendar, this is currently a known bug that we’re working on a prompt fix for.
So for now, can you download The Events Calendar, install it on your site, and activate it? You certainly don’t need to use the calendar features by any means; but its mere presence on your site should temporarily fix this issue.
After the next update of Event Tickets you should be able to uninstall The Events Calendar and not have that fatal error any longer.
Please let us know if this helps!
George