Set the race to an earlier date on a training plan

I'm into week 11 of a 14-week training plan with coach Greg and accidentally changed the race date to a week later than the actual race. Now I cannot change it back at all! Don't want to abandon then plan plus I cannot see the upcoming activities beyond one week so I cannot even enter them manually! 

Luckily, I have a running buddy who's on the same plan, but their pace is 30 sec faster so it's not quite the same. I've been skipping through planned activities (using lap button) and then manually entering and running my friend's workouts with reduced pace but there is no way to link these manual activities to the plan.

Any other ideas would be appreciated. And no response from Garmin support so far :/