At the fan club party?
I think Carrie was aiming for the same acoustic format used at the earlier Songwriters Night. (That was successful - and she seems at home with the songwriting community). Then she came with just Shawn, to accompany her on guitar, and Hillary came with her now fiance, Cary Barlowe. From the pictures, it looks as if they're using a similar format. I think it works well - it's more intimate, allows some fun and asides, highlights the voices, and gives fans a fresh take on the songs.
The band have worked hard, and are probably enjoying some down time with families!