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You can use a fungicide to help control powdery mildew, but you should apply it judiciously as it can damage soil health and persist in the soil. Most of the time, proper watering, surface drying, and limiting shade can control powdery mildew without needing harsher interventions. If you have a repeated problem with powdery mildew, you can also try planting a shade-resistant type of grass that will be less susceptible to the fungus.

Overfertilizing can burn and kill the grass as well as upset the soil's nutrient balance, leaving your grass prone to disease and infestation. You'll know that you have overfertilized your burn when you have recently fertilized and begin to see brown and yellow patches of dead grass that need to be reseeded. 

Fescue grass is a relatively low-maintenance grass type, meaning it doesn’t require much more attention than regular watering, dethatching, and mowing. Some fescues even grow slowly enough for hard-to-reach areas, particularly those inaccessible by the mower. Following a seasonal maintenance schedule will help your fescue lawn stay green, healthy, and durable for years to come.

Yes, after the lawn is overseeded post-aeration, most of the seed germinates in the aeration holes. This leaves the soil undisturbed while lush and healthy grass will grow in the holes' place. The point of this is to create extra turf density in areas that really need it, such as a large patch of dead grass where a shed used to be.