<p>From what I remember there are three sessions but they aren’t a “weekend” as in Saturday and Sunday. I know two overlap like Sunday-Monday, Monday-Tuesday and those are usually a week before the third session. </p>
<p>Also, my department advisor asked me if I could be free to talk to prospective students on April 21 and 28, so I’m thinking that is one of the days. I’d venture to say that it will be April 20-21, April 21-22 and April 27-28. </p>
<p>You could try doing a search on the Northwestern page. The admitted students program is called “Preview NU.” Hope that helps and hope you hear good news. Viel Glück!</p>