Shoehorn a Submit Event link to the tribe calendar buttons

<span class='tribe-events-calendar-buttons'>
    <!-- change abc.com/events/community/add to whatever is appropriate in your case -->
    <a class='tribe-events-button-off' href='http://abc.com/events/community/add'> Submit Event </a>
    <a class='tribe-events-button-off' href='<?php echo tribe_get_listview_link(); ?>'><?php _e('Event List', 'tribe-events-calendar'); ?></a>
    <a class='tribe-events-button-on' href='<?php echo tribe_get_gridview_link(); ?>'><?php _e('Calendar', 'tribe-events-calendar'); ?></a>
</span>