I agree with everything that Rev. Fuller mentioned, especially the sliding scale for fees. In my area, a 4' x 8' space at a bridal show costs $500 -- that's alot of money to invest with no guarantee of any return.
I have had results similar to Rev. Fuller's from my own show raffles -- even the winner of my complete wedding package never responded to my email letting her know she'd won. (Why even enter if you don't want the prize?)
I've attended a number of bridal shows in hopes of networking with event planners, and have yet to find one at a bridal show. Most of the vendors have been photographers, DJ's, and florists.
Most of the shows have taken place in rooms that were not meant to house a trade show, so that the space was claustrophobic and traffic patterns impossible. The attendees were herded like cattle through narrow spaces; you couldn't get to the vendors' tables, and you couldn't get around the crowd.
For myself, I'd rather invest the time and money in contacting event planners and venues directly to market my services -- that seems to be a more successful process for me.
Marti Barton, Officiant