Well, that's essentially what happened to the European Union in 2007 when they threw themselves a 50th Anniversary Extravaganza. Reports at the time talked of EU-sponsored "citizen parties," street festivals and public celebrations that were largely ignored by the public. About the only thing that Europeans can ever agree on is their differences, and even after 50 years of conditioning it seemed few outside of Brussels were stirred by the EU flag or the thought of half a century of political union.
Perhaps that's because 2007 did not really mark the 50th anniversary of the EU or 50 years of political union at all. No, 2007 was the 50th anniversary of the signing of the Treaty of Rome, a 1957 compact to form a common market and customs union between six European nations. It is doubtful that many people beyond the handful of Bilderbergers and globalists who signed the treaty could have imagined that it would result in a grandiose anniversary celebration for the European Union 50 years hence.
(FUN FACT: The "Treaty of Rome" that was signed on March 25, 1957, was literally a blank document because "[t]he Italian state printer had not met the deadline.")