At which event did Disney officially launch its worldwide pin-trading program in 1999?

Disney officially launched its worldwide pin-trading program during the Millennium Celebration in 1999. The promotion encouraged guests to wear, collect, and exchange Disney pins with cast members and other visitors.

The program began at Walt Disney World and spread to other Disney destinations. Pins commonly depict characters, attractions, anniversaries, resorts, and special events. Cast members often wear lanyards or display boards so guests can ask to trade according to the applicable rules.

Pin trading is different from simply buying souvenir pins. Its social element is the exchange itself, which made the merchandise part of an activity rather than only a keepsake. Limited editions, event releases, and location-specific designs have helped create a large secondary collecting culture, although rarity and value vary widely.