Wiktionary
the party is over
phr. An irresponsible or carefree period has ended; it is time to be serious or take responsibility.
Wikipedia
The Party Is Over
The Party Is Over is a 1960 Argentine drama film directed by Leopoldo Torre Nilsson. It was entered into the 10th Berlin International Film Festival. The film depicts the political corruption in Argentina in the 1930s, a period known as the Infamous Decade.
Usage examples of "the party is over".
Perhaps we'll be able to come back before the party is over, if we don't run into anything exciting.