Sheikh Baha'i Commemoration Day; National Entrepreneurship Day; Architecture Day, Ordibehesht 3. This date in the Iranian calendar honors Sheikh Baha'i, a prominent scholar and architect of the Safavid era, known for his significant contributions to architecture and engineering, including the design of Isfahan's water distribution system. The day is also recognized as National Entrepreneurship Day and Architecture Day in Iran. In recent years, Ordibehesht 3 has become an occasion to highlight the role of entrepreneurs and architects in the country's economic and cultural development. Various events and programs are held to emphasize innovation, creativity, and the importance of Iran's architectural heritage.