Xuéxiào jǔbàn le Lǔ Xùn dànchén yībǎi sìshí zhōunián de huódòng.
The school held an event for the 140th anniversary of Lu Xun's birth.
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诞辰 is a formal/literary term used for birthdays of important historical or public figures. For ordinary people, use 生日 (shēngrì). You wouldn't say 你的诞辰 to a friend.