Some calendar questions

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iOS and iPadOS

Hi. Is there any other sites where I can subscribe to calendars other then icalshare.com? There is a calendar I want that they don't have. Also, I have calendars turned on in iCloud as well as in all my email accounts on both my iPhone 6 and my iPhone 4s. I subscribed to some calendars on my 6 and they will not synk to my 4s. Why?

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