National Information Openness Day (Hari Keterbukaan Informasi Nasional, HKIN) is observed in Indonesia every April 30. Established in 2015, this day commemorates the promulgation of the Public Information Openness Act of 2008, which underscores the importance of transparency and collaboration in governance. The observance focuses on citizens' rights to access government documents and proceedings, promoting effective public oversight and accountability. Events such as seminars, webinars, round table discussions, and conferences are held to highlight the significance of public information openness. The concept of open government, which dates back to the Age of Enlightenment, emphasizes government transparency, accountability, and citizen participation. In Indonesia, the Public Information Openness Act outlines the rights and obligations of public information requesters and public bodies, ensuring that information is accessible and disclosed in a timely manner.