It is confusing.. I tried to make that very clear in the tutorial.
"Remember, the Events control returns CalendarDateTime objects, so we need to refer to the $Event accessor to get to those fields."
So what you're saying is that when you saw this:
<div class="workshop-image">
<% control Event.Image %>
<% control CroppedImage(100,100) %>
<img src="$URL" alt="" />
<% end_control %>
<% end_control %>
</div>
<dl>
<dt>Category: </dt>
<dd>$Event.Category</dd>
<dt>Sponsor: </dt>
<dd>$Event.Sponsor</dd>
</dl>
It wasn't apparent to you that you were still in the <% control Events %> ?