Gowkie Day-- (April Fool's Day)

April Fools' Day spread throughout Britain during the 18th century. In Scotland, the tradition became a two-day event, starting with “hunting the gowk,” in which people were sent on phony errands (gowk is a word for cuckoo bird, a symbol for fool) and followed by Tailie Day, which involved pranks played on people's derrieres, such as pinning fake tails or “kick me” signs on them.

And, as promised, a poem. This one is by Dorothy Parker:

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Oh, life is a glorious cycle of song,
A medley of extemporanea;
And love is a thing that can never go wrong;
And I am Marie of Roumania.