Add event category description to views

add_action( 'tribe_events_after_header', 'add_event_category_description' );

function add_event_category_description() {
    // Does this request relate to an event category? Which one?
    $category = $GLOBALS['wp_query']->get( 'tribe_events_cat' );
    if ( empty( $category ) ) return;

    // Load the category object
    $category = get_term_by( 'slug', $category, TribeEvents::TAXONOMY );
    if ( false == $category ) return;

    echo apply_filters( 'the_content', $category->description );
}