Conventions occur annually at the state and national level. Seminars are held during the
conventions to introduce new technologies, to present new developments in various
fields, and to discuss blindness-related issues. Prominant venders frequent the
conventions to allow hands-on interaction with their products, to provide training, and to
introduce new features and models. Many organizations attend the convention as
presentors, vendors, trainers, or just to interact with their patrons and clients.