With such choices, it's usually the single-form attributive noun version that predominates. Apparently not in this case. But both variants are very common; 'more correct' is not a helpful concept here.
– Edwin AshworthNov 07 '23 at 19:49
From noun adjunct article they have example of "arms race" as a lexical exception. When I think of a calendar, I think of many events being displayed on (or having) a single calendar. Does that mean plural "Events' Calendar" can become "Events Calendar" by dropping apostrophe. If single-form usually predominates ... therefore it's fine to use "Event Calendar"?
– GogromaTNov 07 '23 at 20:26
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What @EdwinAshworth said. Apparently, although we favour plural *events calendar*, the more-common-overall singular reasserts itself with an appointment* calendar*. I'm sure "correct" is a worthless concept here, and I seriously doubt there's any meaningful reason for that difference!
– FumbleFingersNov 07 '23 at 23:36
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'A lexical exception' seems too categorical; there are quite a few examples where the attributive noun is customarily, perhaps necessarily, plural-form (sports reporter / systems analyst / travellers cheque / dogs home or dogs' home / ...). // 'Events' Calendar' looks outlandish. In the UK, the new form mens has appeared; working mens clubs is the more usual form nowadays. Even childrens clothing department is considered the better option by some (though my spell-checker is flagging it)....
– Edwin AshworthNov 08 '23 at 14:52