The best way to find them is to keep your eyes open. Watch at Easter - most of the good shows also do Easter shows! You can also do searches online or even on Facebook. Make sure you are looking LOCAL. If you do a search for "craft shows" make sure you also add your city or area.
Vendor shows are a little different - with my business, the difference is craft shows, I make and sell cards or premade items. With vendor shows, I bring my business - catalogs, sample products, display only items.
The big difference is the GOAL - do you want to sell something, make $ or do you want to introduce your business, workshops, etc. Always determine your goal FIRST and make sure that everything else follows that goal. (And remember if your goal is too big, people will be confused and may pass you by.)
Hope this helps! Kath*