Yeah,now that you said it,I think that Gray and Elfman will need some "convincing"-Either through some talk or Natsu kicking their asses,lol. I don't think Erza's trauma will stop her from rejoining since she is among the most loyal and steadfast to fairy tail.
Lamia scale is Lyon's and Chelia's guild. Maybe we will find out something about Gray,Juvia and Wendy? Still,thanksgiving? What a lame chapter name is that :/
Oh well,this chapter was certainly funny. Lucy is certainly harboring resentment as to how the guild just disbanded and drifted away like leafs in the wind.
She may be be happy that she reunited with Natsu and Happy and is back to the adventure,but I don't think that's enough to mend her bitterness. I imagine it will get worse when she meets the rest,specially the ones that will probably refuse at first to rejoin.