Today, 28 December 2012 is Lalita Jayanti, Shodashi Mahavidya Jayanti, or Lalitha Tripurasundari Jayanti. It is the incarnation day of Goddess Lalitha.
Lalita Jayanti falls on Margashirsha Purnima. Shodashi Mahavidya is referred to as the third Dashamavidya Goddess. Dasamahavidya are a group ten powerful manifestations of Goddess Shakti.
Here you can read more about Lalitha Jayanti
To read more about Lalita Dashamavidya, click here