Riot Fest and Riot Fest Chicago merge

For some reason Riot Fest 2015 in Chicago is listed as it's own festival and not included with the previous ten Riot Fests. Is there any way to merge them?

Riot Fest 2005 – 2014 are listed here: http://www.setlist.fm/festivals/riot-fest-6bd6be32.html

And Riot Fest 2015 is listed separately here: http://www.setlist.fm/festivals/riot-fest-chicago-43d687db.html

There was a change of venue between 2014 and 2015, but considering there were several changes of venues between 2005 – 2012, I don't see why this would result in it being considered a separate festival.

It's a minor point, but for the sake of accuracy, I feel it should be changed.