Bridal show length?

I've never been to a bridal show and we've registered for one on SI at the end of september -- can anyone tell me approx how long they last? is it an organized presentation or is it a 'fair' of sorts, where you wander around and talk to anyone who interests you and you can come and go as you please?
TIA!!

It is the latter of what you described. You wander around and visit vendor's tables. You can show up and leave whenever you please.
But sometimes there are timed events, like a DJ showcase or something, so if you're interested in something like that then you need to know a time for it. Also, they usually do raffles which are drawn at the end of the night.