First off, I'm not entirely certain what type of grass I have but I believe it's a fescue? I'm hoping someone can help me out and maybe offer some advice as to what I can/should be doing, thanks in advance.

I have been seeing the weed in the first pic every year and have no idea what's it called or what to do about it.

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Then, starting sometime last year around late summer I think, a small brown spot developed and has gradually grown to what you see in the pic below. Is this some sort of fungus or disease?

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