code: def live_chat_banner(context):
      
      context = copy(context)
  
      # Find any upcoming or current live chat. The Chat date must be less than 5
      # days away, or currently in progress.
  
      oldchat = LiveChat.chat_finder.get_last_live_chat()
  
      if oldchat:
          context['last_live_chat'] = {
              'title': oldchat.title,
              'chat_ends_at': oldchat.chat_ends_at,
              'expert': oldchat.expert,
              'url': reverse('livechat:show_archived_livechat')
  
          }
  
      chat = LiveChat.chat_finder.upcoming_live_chat()
      if chat is not None:
          context['live_chat_advert'] = {
              'title': chat.title,
              'description': chat.description,
              'expert': chat.expert,
              'commenting_closed': chat.comments_closed,
              'cancelled': chat.is_cancelled,
              'archived': chat.is_archived,
              'in_progress': chat.is_in_progress(),
              'url':  reverse(
                  'livechat:show_livechat',
                  kwargs={
                      'slug': chat.slug}),
              'archive_url':reverse('livechat:show_archived_livechat')
  
          }
          context['live_chat_advert']['datetime'] = {
              'time': chat.chat_starts_at.time,
              'date': chat.chat_starts_at.date
              }
      return context
docs: Display any available live chats as advertisements.