anchor.diff:    <% else %>
       <p>No one has signed up yet...</p>
     <% end %>
  -</div>+</div>
  +
  +-->
positive.code: 
  <%= render 'block_location' %>
  
  <div class="block">
    <h2>Itinerary</h2>
  </div>
  
negative.code: <div class="block block-alternate">
    <h2>Sponsors</h2>
  </div>
  
  
  <div class="block">
    <h2>Attendees</h2>
  