"I thought I was working, sir!" All the wide placidness of his halcyon days was gone; he saw himself driven back to Pickerbaughism.
There are no more uses of "halcyon" in the book.
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It was used for more things than family reunions, however: Negroes played basketball there, the Klan met there in its halcyon days, and a great tournament was held in Atticus’s time in which the gentlemen of the county jousted for the honor of carrying their ladies into Maycomb for a great banquet.
Harper Lee -- Go Set a Watchman
This is a little exhibition we used to tour around the Continent back in the halcyon days.
Ransom Riggs -- Miss Peregrine’s Home for Peculiar Children