Your plan
Race day, and after the race
Race week is light, with at most one short session at race pace, and the day before is rest or a short optional shakeout. On race day your plan shows the race itself, and Race day morning sends a notification if it is on.
Record the race as any run, on your watch or your phone. A race recorded on another watch arrives on its own through Apple Health, as every run does. It counts as a race for your race fitness.
From the day after, Home shows PLAN COMPLETE with Start a new plan, so you can build the next block when you are ready. Your runs, records and stats stay.