Updated snippet (change calendar/list titles) TEC 2.0.11

function change_upcoming_event_title($text) {
    if (strpos($text, 'Upcoming Events') !== false)
        $text = str_replace('Upcoming Events', 'Texas Wine School Classes', $text);

    elseif (strpos($text, 'Calendar of Events') !== false)
        $text = str_replace('Calendar of Events', 'Class Calendar', $text);

    return $text;
}

add_filter('tribe_get_events_title', 'change_upcoming_event_title');