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<?php
// bail if not on the wp-admin Event edit screen
global $current_screen;
if (
	! class_exists( 'Tribe__Admin__Helpers' )
	|| ! Tribe__Admin__Helpers::instance()->is_post_type_screen( Tribe__Events__Main::POSTTYPE )
	|| empty( $current_screen )
	|| 'post' !== $current_screen->base // the events post type's add/edit screen
) {
	return;
}