Intercultural Communication Activities (KAB) are shown by how people adapt to other cultures. The ability of one's cultural adaptation as an open system to evolve with the surrounding social and cultural environment will, in turn, be able to build social harmony. Social harmony in society is reflected in the process of adaptation of Runi Palar, in the initial period of residence in Ubud, Gianyar, Bali. Runi, who transformed from a prima donna to a classical Javanese dancer, became a designer of silver jewelry so that today it is known as the "Queen of Silver Jewelry" in Indonesiastarting a silver jewelry business since 1966 in Bandung until it continues to grow and is widely known abroad, especially in the Japanese, European, American and of course Indonesian markets. After 35 years of living and developing a business in Bandung, in 2000, Runi and her husband decided to move to an area that was entirely new for them, Ubud, Bali. This initial period of stay in Bali is the reason why this research is focusing on the process of cultural adaptation by Runi with the local community as part of KAB activities. This research is conducted to find out how the activities of KAB Runi in building social harmony with the surrounding community. The research subject is Runi Palar. The object of this research is something related to the activities of KAB by Runi Palar in building social harmony with the people of Banjar Abiansemal, Lotunduh, Ubud, Gianyar, Bali. The results show that communication establishes an attitude of tolerance, mutual understanding, and respect in a very effective way amid cultural, ethnic, and religious differences in the domestic context. Values in the context of KAB can be used as guidelines in interacting with people of different backgrounds to build social harmony as it contains moral values in them.