Import: on your Mac, Calendar → File → Export → Export…, then pick that file. Events show as busy time so plans work around them.
On iPhone: Calendar → Calendars → ⓘ next to your calendar → turn on Public Calendar → Share Link → Copy, then paste it here. It syncs every 30 minutes; anyone with the link can see that calendar.
In Canvas: Calendar → Calendar Feed (bottom right) → copy the link and paste it here. Assignments sync every 30 minutes. Keep the link private: anyone who has it can see your due dates. The feed doesn't say what you've turned in, so check finished work off here.
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