The name of the ceremony is "GAURA-GAURI POOJA" means marrige between lord SHIVA and Goddess PARVATI". Gond tribes celebrate this festival during famous Diwali festival of hindu's but Gaura-Gauri is their festival, on that day they first go to river bank to collect clay in the afternoon and then same night they make Gaura (lord shiva) in one house and Gauri (parvati) in other house. They take whole night to make it. They do lot of rituals during preparation of Gaura-Gauri Then the family who makes Gaura go to the family who makes Gauri very earlyin the morning (first photo's), where gauri family welcome them. Then marrige between Gaura-Gauri take place with lot of ritual. People give present to Gaura-Gauri to be blessed. Then gaura family take Gauri to gaura family on the way people come and give worship to get blessing. So its marriage between lord Shiva and Parvati and this is how their marriage season starts.