This is about bar crawls.  Previous themes:

• 2009 – Clocks (1 bar every hour to 12 hours)
• 2010 – Golf (Each bar was a hole with a par)
• 2011 – Baseball (Different drinks and events counted as different hits)
• 2012 – Harry Potter (Complete with sorting hat and houses)
• 2013 – Thirsty Games (Tributes and guest Cesar Flickerman)
• 2014 – Pirates vs Ninjas vs Zombies vs Cowboys
• 2015 – Apparently didn’t happen
• 2016 – Boycotts on a massive scale