anchor.diff:          <ul class="nav navbar-nav">
             <% if assigned_nonchild_events_by_date.count > 1 %>
               <li class="dropdown">
  -              <a href="#" class="dropdown-toggle year" data-toggle="dropdown"><%= nav_event.slug %><b class="caret"></b></a>
  +              <a href="#" class="dropdown-toggle year" data-toggle="dropdown"><%= nav_event.try(:slug) || "Events" %><b class="caret"></b></a>
                 <ul class="dropdown-menu">
                   <% assigned_nonchild_events_by_date.reverse.each do |event| %>
                     <%= content_tag(:li, link_to(event.slug, event_path(event), :class => 'year'), :class => (nav_event == event) ? 'active' : '') %>
  
positive.code:               </ul>
              </li>
            <% end %>
            <li><%= link_to nav_title(nav_event), nav_path(nav_event), :class => 'proposals_or_sessions' %></li>
            <% if nav_event.schedule_published? %>
            <li><%= link_to 'Schedule', event_schedule_path(nav_event), :class => 'schedule' %></li>
            <% end -%>
            <% if nav_event.proposal_status_published? %>
            <li><%= link_to 'Speakers', speakers_event_path(nav_event), :class => 'speakers' %></li>
            <% end -%>
            <% if bof = nav_event.children.first(:conditions => ['slug LIKE ?', '%bof']) %>
              <li><%= link_to 'BoFs', "/events/#{bof.slug}/#{bof.proposal_status_published? ? 'sessions' : 'proposals' }", :class => 'bofs' %></li>
            <% end %>
          </ul>
          <ul class="nav navbar-nav navbar-right">
  
negative.code: <% nav_event = assigned_event.try(:parent_or_self) %>
  
    <div class="skip-link">
      <a href="#content" title="Skip to content">Skip to content</a>
  