Which significant demonstration took place on February 23, 1917?

The significant demonstration that took place on February 23, 1917, was the International Women’s Day March. This event marked the beginning of the February Revolution in Russia. Women workers in Petrograd organized the march to demand "bread, peace, and the end of autocracy," highlighting the dire economic conditions and social injustices they faced, particularly during World War I.

The march garnered widespread support from workers and students, leading to larger protests that eventually resulted in the abdication of Tsar Nicholas II. The significance of this demonstration lies in its role as a catalyst for broader revolutionary activities in Russia, ultimately leading to the establishment of a provisional government.

While the other options reference important events, they do not pertain to the specific date mentioned in the question. The October Revolution occurred later in 1917, the Kadet Rally is contextually less significant in this timeframe, and the October Festival does not hold historical significance connected to that date.