Exclude_event_category.php

function tribe_exclude_events_category( $wp_query ) {
// only filter the query if the user cannot edit pages (< editor)
		 if (!current_user_can('edit_pages')) {
			$exclude_cats = array('exclude-me'); 

			// Join with current tax query if set
			if (is_array($wp_query->get( 'tax_query')))
				{$tax_query =$wp_query->get( 'tax_query');}
			else
				{$tax_query = array();}

			// Setup an exclude from the tribe_events_cat taxonomy
			$tax_query[] = array(
				'taxonomy'  => Tribe__Events__Main::TAXONOMY,   // sidebar ist: "tribe_events_cat"
				'field'     => 'slug',
				'terms'     => $exclude_cats,
				'operator'  => 'NOT IN'
			);

			 if (!is_single() && !is_tax()) { $wp_query->set('tax_query', $tax_query); }
		}

		return $wp_query;
}

add_action( 'pre_get_posts', 'tribe_exclude_events_category', 100, 1 );