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There's one language for which Caps Lock is needed - Hebrew. To type Hebrew vowel points (a.k.a. Niqqud) one has to press Caps Lock and then Shift-(Number) to type the vowel. It is quite ridiculous, but that's the de facto standard in Windows and Macs. Ubuntu has a different solution for that (AltGr; not perfect, but better than Caps Lock), but we all know that Windows is far more common.
In fact, it is so ridiculous that few people even bother to type the vowel points. They are not required in most texts, but are sometimes needed.
I already contacted the Standards Institute of Israel with a proposal to change it, but the current situation remains. So please be aware of this in your campaign.