Getting rid of ‘some’ of the Pages in your sidebar would require using the exlcude= parameter for the template tag, wp_list_pages(). So, in your theme’s sidebar.php file, change <?php wp_list_pages('title_li='); ?>
to <?php wp_list_pages('exclude=7,8&title_li='); ?>
the above excludes page ID 7 and 8.
And of course for Pages in the header, look at header.php and the use of wp_list_pages there.
also….i removed those two sections from the theme’s index.php file, but it didn’t remove the calendar icon, nor the “posted under.” why might it not have? i definitely selected “update” after making the changes, and confirmed the pieces of code were gone.