Reduce extra db calls

Author: rsmithlal

app/views/better_together/events/index.html.erb

@@ -17,13 +17,13 @@
     </div>
   <% end %>
 
-  <% if @upcoming_events.any? || @past_events.any? %>
+  <% if @upcoming_events.size > 0 || @past_events.size > 0 %>
     <h2>Upcoming</h2>
     <div class="row">
       <%= render(@upcoming_events) || render('none') %>
     </div>
 
-    <% if @past_events.any? %>
+    <% if @past_events.size > 0 %>
       <h2>Past</h2>
       <div class="row">
         <%= render(@past_events) %>