original question: How many bridges was opened on the date when [IllumiNations] was closed?
answer: 12
answer type: Bridge.
auxiliary information: IllumiNations was a series of nightly fireworks shows at Epcot before IllumiNations: Reflections of Earth was created in 1999 for the Millennium Celebration.
The date when [IllumiNations] was closed also is when how many bridges were opened?