What is the name of the rain goddess praised in a Tamil folk dance during Isha Gramotsavam?
Isha Gramotsavam:  In past years, venues have featured rural food festivals with traditional food items, rural cultural shows featuring Tamil folk dances such as Karakattam, Oyilattam and Thapattam, and handicrafts from various regions of Tamil Nadu. Karakattam: Karakattam (Tamil: கரகாட்டம் or ""karakam" (கரகம் 'water pot') dance") is an ancient folk dance of Tamil Nadu performed in praise of the rain goddess Mariamman.
Mariamman