Make sure you are reading the small print on the vendor show contacts.
When is the last day to cancel if you cannot attend? Rain Dates?
Tents or supplies required? Specific color?
Pics required? Is it judged?
How much is the cost of the booth? Can you Realistically sell enough product and make a profit at this show?
How many other vendor will be there with the same type of product as yours? You can ask! It is important if you are going to make a profit.
Some food for thought!