The Supreme Soviet of Turkmenistan decided to adopt the law "About Independence and Bases of a State System of Turkmenistan", effectively declaring its independence on 27 October 1991. After the disintegration of the USSR, the Turkmen SSR became one of the last republics in the former Soviet Union to proclaim state sovereignty. In 2018, the government of Turkmenistan voted to move the date exactly a month back to September 27.
When it comes to formal protocol, there is a ceremony of laying flowers at the Independence Monument, followed by a massive military parade on the central square of Ashgabat. The military parade is followed by the mass procession of representatives of the five provinces, the capital of Ashgabat, as well as workers in various branches of Turkmenistan’s economy.
On Independence Day, a tradition of awarding outstanding citizens and cultural figures state awards is common practice. World leaders such as the President of Russia and the President of the United States typically deliver congratulations to the Turkmen nation. In many cities of the country, festive events and concerts are held. Salutes and fireworks in honor of independence are also traditional events. The holiday is celebrated with festivities on September 27.
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According to en.wikipedia.org