Both groups are nearing or all ready achieved Level 3, so they're moving to the campaign proper. The book contains some hints for the PCs to investigate, but I'm not entirely sold on why they would ever go to Feathergale Spire for anything other then curiosity.
The members of the Society as written in the book are flamboyant, mostly rich and priviledged Waterdhavians. The first thought that comes to me is that they must be similar to a fraternity or sorority. Popped collars, lots of female skin, parties for the sake of partying, that whole deal.
If the knights of the Feathergale Society were truly going to celebrate their ten year anniversary, they would let the neighboring towns know of it. The more, the merrier!
I had these posted across Red Larch, irritating the locals:
