Eigigu Day is observed in Nauru every June 26, commemorating the anniversary of the founding of the Nauru Cooperative Society, which later evolved into the Eigigu Holdings Corporation. This public holiday highlights the contributions of the Eigigu Holdings Corporation to the nation's economy and is celebrated with community events organized by the corporation. The Nauru Cooperative Society was established in 1923 to provide Nauruans with essential goods at lower prices than foreign traders, aiming to reduce dependence on external merchants. Over time, it became a significant commercial entity on the island, managing various retail operations. The holiday was officially established in 2023 to mark the 100th anniversary of the cooperative's founding, reflecting its historical importance and ongoing legacy in Nauru's economic landscape. The Eigigu Holdings Corporation, named after a figure from Nauruan mythology, continues to operate as the government's main business arm, overseeing various subsidiaries that contribute to the local economy.