Hi @OliverOK,
Have this flow run with an daily occurrance.
This flow action will take out all calender events 5 days from today.
Use this expression :
formatDateTime(adddays(utcnow(),5),'yyyy-MM-dd')
After you've added the expression, add 00:00:00 in start time and 23:59 in end time.

Then add a send an email, and send an mail to each recipient you want.
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Best Regards
Heartholme