The 1930 event in India that protested the British salt tax by making salt at Dandi was the Salt March.
Mahatma Gandhi began the 24-day march from Sabarmati Ashram on 12 March 1930. He and his followers walked roughly 240 miles (390 kilometres) to the coastal village of Dandi in Gujarat, arriving on 6 April. Gandhi then violated the colonial salt laws by producing salt from seawater.
The protest challenged both the tax and the British monopoly on salt production. Salt was an especially powerful symbol because it was essential to everyone, including poor households. The march helped launch a wider phase of civil disobedience against British rule.
The Salt March is also called the Dandi March or Salt Satyagraha. It did not immediately end the tax, but it drew international attention to Indian independence and led to mass arrests.