User blog comment:FairyRaven/Fairy Tail Chapter 337: The Golden Plains, Review and Commentary/@comment-121.97.142.172-20130628102103/@comment-203.87.139.100-20130628103227

never expect... maybe the real thing is, this dragon festival is just the beginning,...

the timeline of the vision carla saw was not totally the dragon fest. but another event that will happen.

MAYBE it's not the dragons that made the castle crumble but Zeref/tartaros. And Lucy shouting something MAYBE it is where Lucy will bow down to Zeref.