<p>Where can I indicate, if possible, what did during my Summers on the common app?</p>
<p>I’m planning to list my summer activities on the additional info section, though my employment I will include in the extracurricular section.</p>
<p>Can anyone else lend another perspective?</p>
<p>As heartist noted, the “Activities” section allows you to mark certain activities as taking place solely during the summer - one of which you could elaborate on in the short answer prompt in the Writing section.</p>
<p>Some schools (Stanford immediately comes to mind, but there are definitely others) also ask “How did you spend your last two summers?” in their supplements.</p>