The historical imagery is from February 2010, so it might have something to do with Chinese New Year celebrations.
Parade (historical imagery)
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© Bing Maps
By kkeps @ 2014-11-29 05:37:22
Links: http, www.chinatravel.com
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Scavenger Hunt: The Return of the Old School All Google Maps Scavenger Hunt : Parade in progress (NOTE 1)