i am missing the thumbnail Metabox if i want to create a new event oder edit an existing one. it loonks like my theme is killing it, maybe. is there a way to add one manually? which file do i have to edit.
Try looking in your Screen Options panel in the upper right corner when adding/editing an event and make sure “Featured Image” is checked. That or try adding this to your functions.php file:
add_theme_support( 'post-thumbnails', array( 'tribe_events' ) );