What do you call the 300 or 400 and so on anniversary celebrations?

A 300 year anniversary is called a tercentenary. A 400 year anniversary is called a quatercentenary. (be careful with the spelling of this one!)

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What is the meaning of the English expression a few crumpets short of a proper tea?

I'd guess it means the same as: A few bricks short of a full load. The elevator doesn't go all the way to the top. The lights are on, but no one's at home.

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