Juried events have a selection committee for art & craft exhibitors, and require that you submit slides or photos of your work or products. The selection committee (the jury) reviews all applications before choosing exhibitors for the event. Sometimes there is a nonrefundable jury fee for these events.
Jury standards (and jury fees) will vary a lot -- some are very selective, and others simply want to prevent too much repetition in event exhibitors.
Here are the ways you can search to look for art shows.