Sorry to hear about this, Cody!
Here is what I would recommend doing:
1. Deactivate all events plugins: The Events Calendar, Events Calendar Pro, iCal Importer
2. Delete the existing version of The Events Calendar from the site. This will not erase event data.
3. Once that’s deleted, download a fresh copy of The Events Calendar 4.3.1.1 here → http://wordpress.org/plugins/the-events-calendar
4. Install and try activating this newly-downloaded version of The Events Calendar 4.3.1.1. Any issues?
5. If that activates without errors, then activate Events Calendar Pro. Any issues? If so, then delete this from your site, too, and get a fresh copy of its 4.3.1.1 version from here → http://theeventscalendar.com/my-account/downloads
6. Install that version, activate it. Any issues?
7. Repeat this process for iCal Importer: activate it, if issues delete and re-install, etc.
Let us know if this helps!
George