Final answer:
The excerpt alludes to the Bolshevik Revolution in communist Russia.
Step-by-step explanation:
The excerpt most likely alludes to the Bolshevik Revolution in communist Russia. The Bolshevik Revolution refers to the uprising led by Vladimir Lenin and his followers in 1917, which resulted in the establishment of a communist government in Russia. The mention of a celebration, flag, and singing of a song suggest a moment of victory and patriotism, which aligns with the revolutionary context of the Bolshevik Revolution.
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