Mile race in 4 weeks

This is what I would recommend:

Week 1 - mile race

Week 2 - 800 race

Week 3 - 800 race

Week 4 - goal mile race

Milers don't build fitness the last 4 weeks of their peak. By 4 weeks out the work is already done. Whatever endurance you have from your May marathon and 10k training is what you've got.

From here forward you're just sharpening. You're reinforcing the neuromuscular pathways that allow you to run fast and relaxed. You're probably topping off your lactic acid buffers.

Since you're a 10k/marathon guy, you're probably not used to middle distance racing, so I predict a big improvement simply by racing every week.

Keep the rest of your schedule light. The races will be your hard workouts. Maybe one other lighter workout per week (tempo or short repeats, 200-400's).

Thanks for the suggestion. I pretty much figure that I can only sharpen this point. I like the idea of doing some race pace efforts to get that speed in my legs. Maybe I can do these races and also try a workout of 200s or 300s too so I can work on my turnover.