Hey Jon,
Thanks for reaching out to us!
Unfortunately we’re unable to answer support related questions here in the Translation or Pre-Sales forums. However, you can reach out in our forums on WordPress.org.
To help get you pointed in the right direction, you can start by following the Testing for Conflicts procedures to see if that helps to resolve the Featured Image issue. For the theme styles, you can take a look at the files and see if there is a “tribe-events” folder there. If so, you can remove and styles from within that folder and it will allow the plugin styles to show rather than those that are customized within your theme.
I’ll go ahead and close this thread for now. If you have an account here, you can log in and open a thread in our premium forums or you can also reach out in our forums on WordPress.org.
Thanks!