The evening before, and the morning of
Every scheduled Fed and ECB decision gets two reminders, and each one carries the current odds rather than just the date. You walk into the announcement knowing what was priced in going in.
Checking the odds every morning is a chore. RateRadar reverses it: a reminder before each Fed and ECB decision, and a nudge when the odds of a cut move past a threshold you set.

Every scheduled Fed and ECB decision gets two reminders, and each one carries the current odds rather than just the date. You walk into the announcement knowing what was priced in going in.
Between refreshes the app compares the new leading outcome against the last one it saw. If the leader flips, or its probability moves by at least your threshold, you get one alert naming the meeting and the move.
The sharp move threshold is a number of percentage points, adjustable between 5 and 25, and it starts at 8. Set it low and you hear about most of the drift into a meeting. Set it high and you only hear when something has genuinely repriced. Either way, the alert fires at most once per meeting per refresh, and the app compares against the last snapshot it actually saw, so nothing is double counted.