Christmas type holiday that can be thrown into any city/town.
The addition of “irrelevant” details adds local colour to a campaign world, giving the impression that the DM has thought very deeply about the history of even the smallest architectural feature.
The local temple is known for putting words of wisdom of stele, in and anround the temple. These words of wisdom are normally temple proverbs or wise words, but sometimes they are "singing the praises" of any large contributor or a noble who grants them a special law. If you need proverbs and quotes for them, search a few quote and proverb sites, concentrating on religions like the temples. Put these quotes in a word doc or list, that way you can always "whip out" a bit of wisdom.