New York City Mayor Michael Bloomberg’s younger daughter was set to undergo additional tests Monday after sustaining a concussion during a fall while performing at an equestrian tournament. http://cityroom.blogs.nytimes.com/2010/11/08/bloomberg-says-daughter-is-recovering-after-fall/?scp=9&sq=mayor%20bloomberg&st=cse Georgina Bloomberg, 27, was briefly unconscious and fractured several vertebrae Friday when she…