Adrian Perkasa delivered an insightful online talk on Pranatamangsa (traditional Javanese agricultural timekeeping) and the specific ecological calendars of the Tengger region (in Bahasa). The virtual event was hosted by The Alliance of Independent Journalists (Indonesian: Aliansi Jurnalis Independen, abbreviated as AJI) in Surabaya.

To provide a comprehensive view of these living traditions, Adrian Perkasa was joined by prominent Tengger knowledge holder Romo Eko Warnoto, alongside a panel of local researchers. Together, they explored the deep connections between indigenous timekeeping and environmental stewardship.

The core of the discussion centered on the Kalender Tengger (Tengger Calendar). The panel highlighted that this is not merely a tool for marking time, but a profound indigenous knowledge system. They discussed its crucial role in maintaining harmony in human-nature relations and guiding the spatial governance of the Tengger community’s living spaces. By examining these traditional calendars, the event underscored how localized ancestral knowledge continues to offer vital strategies for sustainable resource management and grassroots ecological resilience.