The party and Natsu's surprise were quite nice in my opinion. A more relaxed scene after a heavy fight is always good. It feels like a huge stretch they could really keep the whole dragon incident a secret, but since this is Fairy Tail, I guess it suits the series.
As soon as the old woman appeared and the letter was revealed to be from Ul, I knew that's who the woman was. I'm kind of surprised the Jellal and Meredy didn't, after all the time they spent with her. Too bad with Doranbolt having erased the whole dragon festival from the minds of all officials, there's no way they can pardon Jellal. But then again, it's the utterly useless council that is only concerned about their own power and standing, so I doubt they would pardon their own mother. I was hoping to see a parting scene with Erza and Jellal, but I guess that was too much to ask for from a story so unconcerned with romance (after all, even Gray seem to grow only colder toward Juvia).
Lastly I was quite dissatisfied with how Zeref turned out. The man has some mental issues to so quickly flip from sad ruminations to wanting to slaughter all humans. Unless he was just saying that so that Mavis would arrange for Natsu to slay him.