You and hubby can take care of the paperwork during sheva brachos.
Why not take care of it beforehand?
As for the ceremony, I was thinking along the lines of Prospect Park, or the Bklyn Botanical Garden (I think Wednesdays are free admission to the Garden)
Tuesdays are free admission days at the BBG year-round.
While admission to the BBG may be free, having a wedding there is not. The fee to have the ceremony (with 50 guests) is $425.00. The ceremony must be held outdoors — rain or shine and there is no seating available. Lastly, music is limited to soft small hand-held music.
The Wolf