Countdown to a repeating event

I have a calendar event called “Replace pod” that repeats every 3 days.

How would I pick out the event using it’s title and display a count down in days until the event?

“Replace pod is 3 days”, “Replace pod is 2 days”, “Replace pod is 1 day”, “Replace pod today”.

I’d use a countdown but I tend to nudge the event around a bit in my calendar +/- 1 day evey now and again.