Increase the number of events in the Advanced List Widget. See http://m.tri.be/18iv.

event_limit_list_widget.txt

add_filter('widget_display_callback', 'increase_event_widget_limit', 10, 2);
 
/**
 * Test if the current widget is an Advanced List Widget and fix the event limit if it is.
 */
function increase_event_widget_limit(array $instance, $widget) {
    if (is_a($widget, 'Tribe__Events__Pro__Advanced_List_Widget'))
        $instance['limit'] = 30;
 
    return $instance;
}