Hi there,
Unfortunately there is not an out-of-the-box way to add a second week in the same widget, but you could use CSS to hide the header for the second widget. For the header text, you can change it by doing a template override, or you could also hide both headers with CSS and type in “Upcoming Events” manually above the shortcodes.
If you would like to go with the override, our themer’s guide has instructions on this, and the template you’ll want to copy can be found at wp-content/plugins/events-calendar-pro/src/views/pro/widgets/this-week-widget.php. The title comes from this line:
<?php echo esc_html( tribe_events_get_this_week_title( $this_week_template_vars['start_date'] ) ); ?>
Please let me know if you have any other questions!
Thanks,
Jennifer