Edit: You've got a point about the other guilds not being at the plaza and even Gerard talking to Lahar and Mest. For everything else I'm not sure. IDK what exactly was the Dragon Festival is about, but being Acnologia the dragon king, it can'tbe anything that could be helpful to anyone.
PD: I think it's pretty obvious that this is how Zeref already knew Natsu back at Tenrou island. There is chance Natsu and Lucy jump through the door as the dragons rampage on Crocas and kill everyone, hoping to find in the past a way to save the future.
PD: I think it's pretty obvious that this is how Zeref already knew Natsu back at Tenrou island. There is chance Natsu and Lucy jump through the door as the dragons rampage on Crocas and kill everyone, hoping to find in the past a way to save the future.