The area experienced record-setting rainfall in May and an extraordinarily wet June. During that time, fungus—which thrives in wet, cool weather—was masked by the equally thriving turf.
But with an exceptionally dry spell over the past five or six weeks, stress from drought has descended and the prevalent underlying damage is now plainly apparent.
At this point, the centerpiece of your game plan should be a seeding project between mid-August and Labor Day weekend. A 21-day growth period from germination to full growth is normal, after which you can mow for the first time.