Awesome idea and your site is very well done.
A couple quick things:
1. In the footer of the site you have "Find a Vendor", I think it is supposed to say "Find a Venue"
2. The video is good, but 11 minutes is way too long in my opinion. I got tired of listening after the first 90 seconds. To be honest though, the site is so well done and clear you really don't even need to show the video. :)
3. One thing you may add is venue ratings/reviews. So after someone has booked a venue they could rate it.
Overall looks great and awesome idea. Good luck!