This is a good one for the coaches to weigh in on. One adjustment that I make is to set the start or finish date when I load a plan to accommodate recurring activities during a plan.
For example, I like to reserve my Sundays as recovery days, either rest or recovery effort runs for social runs. I make any final adjustment for my “A” race in the final days before the race to make sure that I am rested and on good form on race day. Entering a plan so structured usually means that Saturdays are endurance runs, so I can do a “race” socially with just some additional miles and still stay within the parameters of the 80/20 plan I want to follow.
I don’t do marathons, so you would need to examine your plan to see if the same recurring patterns appear that are in the 5K and 10K plans.