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Longman Dictionary of Contemporary English
silly season
noun
EXAMPLES FROM CORPUS
▪ The silly season is upon us.
▪ Then that silly season when the oil rigs blew like bottles in a crate of excited stout.
▪ Those parliamentary gossips still in London enduring the boredom of the silly season waited in happy expectation for the scandal to break.
Wiktionary
silly season

n. 1 (context idiomatic English) A period of time, as during a holiday season or a political campaign, in which the behavior of an individual or group tends to become uncharacteristically frivolous, mirthful, or eccentric. 2 (context idiomatic journalism English) A period, usually during the summertime, when news media tend to place increased emphasis on reporting light-hearted, offbeat, or bizarre stories.

WordNet
silly season

n. a time usually late summer characterized by exaggerated news stories about frivolous matters for want of real news

Wikipedia
Silly season

In the United Kingdom and in some other places, the silly season is the period lasting for a few summer months typified by the emergence of frivolous news stories in the media. It is known in many languages as the cucumber time. The term was coined in an 1861 Saturday Review article, and was listed in the second edition of Brewer's Dictionary of Phrase and Fable (1894) and remains in use at the start of the 21st century. The fifteenth edition of Brewer's expands on the second, defining the silly season as "the part of the year when Parliament and the Law Courts are not sitting (about August and September)".

In North America the period is referred to prosaically as the slow news season, or with the phrase dog days of summer. In Australia, New Zealand, and South Africa, the silly season has come to refer to the Christmas/New Year festive period (which occurs during the summer season in the Southern Hemisphere) on account of the higher than usual number of social engagements where the consumption of alcohol is typical.

Usage examples of "silly season".

The place is bomb-proof, Cissie, so if you get scared next time that damn crazy starts blitzing us again, just get yourself down here.

Even if they maintained very tight security, you would expect there to be at least as many Silly Season reports of encounters with time travelers as there were of encounters with flying saucers (in which I emphatically did not believe)-and there weren't.

Even if they maintained very tight security, you would expect there to be at least as many Silly Season reports of encounters with time travelers as there were of encounters with flying saucers (in which I emphatically did not believe)and there weren't.

The scalphunters bought him secondhand from the Dutch and shipped him to Sarratt and probably if it hadn't been the silly season and if the inquisitors hadn't happened to have time on their hands, well who knows whether any of it would ever have come to light?

The arrest of a First League player for murder was a fortune to newspapers in the depths of the silly season.

At any time of the year the individual stories that the two folksingers sowed behind them like depth charges would have been hot copybut God had ordained that Wesley George drop dead in August, smack in the middle of Silly Season.