Question: What is the name of the rain goddess praised in a Tamil folk dance during Isha Gramotsavam?

Context paragraphs:
Rajesh Sai Babu: Rajesh Sai Babu, (born 1 March 1984) is an Indian dancer and choreographer, specializing in Mayurbhanj Chhau dance UNESCO's heritage.  He is descended from Mayurbhanj Chhau performers, the grandson of "Sangeet Natak Akademi Award GURU Ananta Charan Sai Babu" son of Mayurbhanj Chhau Guru Janmejoy Sai Babu.  He is known also as a choreographer and dancer of Bollywood, modern dance,Indian folk dance (garba, kalbelia, dandia) y contemporany dance.  With his father Guru Janmejoy Sai Babu and his brother Rakesh Sai Babu run his 'Gurukul Chhau Dance Sangam' dance company in Delhi, holds dance workshops both in India and abroad.  He teach Bollywood actors like, Shawar Ali(2014) Hari Narayan (2012), Isha Sharvani (2009) and has choreographed apart from musicals, stage shows, music videos and national and international dance festivals and TV competitions as "Dance Bangla Dance".  Now he is on mission to restore Chhau dance of Mayurbhanj and spread it in India and at all the world.

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.  The performers balance a pot on their head .  Traditionally, this dance is categorized into two types- "Aatta Karakam" is danced with decorated pots on the head and symbolizes joy and happiness.  It is mainly performed to entertain the audience.  The "Sakthi Karakam" is performed only in temples as a spiritual offering.

Contra dance: Contra dance (also contradance, contra-dance and other variant spellings) is a folk dance made up of long lines of couples.  It has mixed origins from English country dance, Scottish, French dance styles in the 17th century.  Sometimes described as New England folk dance or Appalachian folk dance, contra dances can be found around the world and have much popularity in North America and the United Kingdom where weekly or monthly dances and annual dance weekends are common.  According to the Contra Dance Links website, contra dancing can be found in all US states except for South Dakota.

Isha Gramotsavam: Isha Gramotsavam is a cultural festival held in the southern Indian state of Tamil Nadu.  The festival features several aspects of traditional Tamil culture, and is conducted every year by the Indian non-profit Isha Foundation.  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.  Additionally, the festivals also feature games and sports.  The multi-sport event is sometimes promoted under the title of the "Rural Olympics."

Naattupurapaattu: Naattupurapaattu is a form of Tamil folk music and Tamil folk culture.

Anitha Kuppusamy: Anitha Kuppusamy is a Tamil folk and carnatic singer, and television host known for her 'Naatupura Pattu', a Tamil folk art.  Anitha aspired to become a singer from a young age.  Apart from singing, Anitha has appeared as a judge on several television reality shows.  Anitha has written few books on cookery and appeared in cookery shows on TV.

Pushpavanam Kuppusamy: Pushpavanam Kuppusamy is a Tamil folk singer, lyricist, writer and music composer of Tamil folk art.He has been credited for reviving the Naatupura Paatu a Tamil folk art.  Together with his wife Anitha Kuppusamy, he has conducted several music concerts of Tamil folk songs.  Kuppuswamy is also an playback singer.  The couple have together brought out several albums of authentic Tamil folk music.  He has also written books on Tamil Folk songs.  He appears on Television Channels like Sun TV, Vijay TV, and Makkal TV performing musical shows.  He is a recipient of Kalaimamani award from the Government of Tamil Nadu.

Tamil folk culture: Tamil folk culture refers to folk arts and crafts of the Tamil people.  Folk arts and crafts are an integral part of the Tamil culture.  Tamil folk arts include music i.e. Naattupurapaattu, dance styles, songs, games, crafts, herbal medicine, food, sculpture, costumes, stories, proverbs, and mythology.

Kollangudi Karuppayee: Kollangudi Karuppayee (Tamil: கொல்லங்குடி கருப்பாயி ) is a Tamil folk singer who has also performed in films.  She is considered one of the pioneers of Tamil folk music; as the first of her genre and background to perform in films, she served as an inspiration for many other folk artistes.  She started her career as a performer on All India Radio about thirty years before her foray into films.  She is a recipient of the prestigious Kalaimamani award for her contributions to music.

Vijayalakshmi Navaneethakrishnan: Vijayalakshmi Navaneethakrishnan is a Tamil folk singer and composer and a renowned exponent of Tamil folk art.  Together with her husband M. Navaneethakrishnan, she has conducted several years of research and study on Tamil folk music and dances and devoted a lifetime to research, collection, revival, and documentation of ancient Tamil folk songs and dances, many of which are fast becoming obsolete.

Supporting paragraphs: Isha Gramotsavam Karakattam
Answer: Mariamman