I would not recommend doing a workout like Eichorn +1 (2x20min efforts) the day prior to your 200km ride. You could use Workout Alternates to find an ‘Achievable’ workout at a shorter duration, but you’re still ultimately targeting the same systems in alternate workouts, so will likely still go into that big ride pretty taxed. If you feel like you’re accustomed to back-to-back really hard days, that approach may be okay for you.
The most effective option for you is to replace Saturday’s Eichorn +1 with an opener workout like Cajon. This is actually what Plan Builder would recommend for B-priority event if you were to select the option to ‘add openers’ to their A and B-priority events when building your plan.
That said, it’s curious that you had a scheduled sweet spot workout the day prior to an A or B-level event. You should be scheduled an opener workout like Cajon at most, or it would removed your pre-event workout entirely.
I’m wondering if when building a plan, did you select ‘Im not training or an event’ while the 200km ride still existed on your calendar as a B-event? By doing this, you’d opt for Plan Builder to not account for that 200km ride and not assign openers or remove workouts the day prior to A or B events. Could this be what happened possibly?
Regardless, Cajon instead of even an alternate of Eichorn +1 would be a great approach, as you’d receive adaptations to make up for that missed workout, and you’d be effectively opened up to perform well on Sunday!
To answer “If the answer is skip it, do I delete the workout or leave it on the calendar so Adaptive Training can see it?”: skipping or deleting a workout doesn’t make a difference as far as Adaptive Training is concerned, it will yield the same outcome for future adaptations that accommodate for a missed workout either way!
That workout is important in the context of your progression in that zone, so another option for you could look like skipping it and doing a TrainNow endurance instead, for example. This will result in adaptations to address developing that system further down in your training plan.
Let us know if you have any more specifics you’d like us to go over, we’ll be happy to help!