Bhai Dhuj, also known as Bhai Tika or Bhai Beej, is a Hindu festival celebrated on the second day of the Diwali festival. It is primarily celebrated in Nepal, India, and among the Hindu communities in other parts of the world. It is not clear if Bhai Dhuj is celebrated in the region of Kashmir specifically. 

During the festival, brothers visit their sisters and apply a tilak (a sacred mark) on their forehead, and sisters perform aarti (a Hindu ritual) and offer sweets and gifts to their brothers. Brothers also receive blessings from their sisters for good health and prosperity. This celebration is considered a symbol of the bond between brothers and sisters and the protection that brothers offer to their sisters.

In Jammu and Kashmir, the festival is celebrated with great enthusiasm, and people participate in various rituals and customs. The Tilak ceremony is performed by brothers on their sisters' foreheads, and sisters apply mehendi (henna) on their hands and prepare sweets and delicacies. Some people also decorate their houses with lights and rangolis (colorful floor designs) and burst firecrackers to mark the occasion.

In summary, Bhai Dhuj is a Hindu festival primarily celebrated in Nepal, India, and among the Hindu communities in other parts of the world, including Jammu and Kashmir. The festival is a symbol of the bond between brothers and sisters and is celebrated with great enthusiasm with rituals such as the tilak ceremony, mehendi, and sweets and delicacies. 

This answer was generated using ChatGPT, so this may or may not be the entirety of the truth for J&K.