I don't recall this event; pointer/linkie/cite, please, so I can go re-read?

The quote comes from Bombshells:

“The one I made for the Red Court in the Congo was deadly enough,” Lord Froggy said, a smug tone in his voice.

My heart pounded even harder. During its war with the White Council, the Red Court had used some kind of nerve gas on a hospital tending wounded wizards. The weapon had killed tens of thousands of people in a city far smaller and less crowded than Chicago.”

My apologies for referencing the wrong city in my OP (didn't have the books close at the moment) but my point stands that there was a link between the Fomor and the RC.

I'd like to think it is a hidden message but honestly, I don't see it. Primarily because Harry is too dumb to understand it. Harry is a smart guy but is clueless until he needs to be. I think the easier answer to this song choice would be that Chicago is known as the Concrete Jungle, and Winter are predators. So the song choice says welcome to this jungle where we are the hunters and you are our prey. This is our territory and you are out of your depth. 

During a recent reread of Summer Knight, I noticed a strange detail that Harry pointed out about the Mother's Cottage. It had a Snowflake on the front door. This cottage is where both of the Mother's live so why is there a snowflake on the door? This is a small detail, but I find it interesting. Maybe Mother Summer once lived in a different house? If so why did she move?

Maybe Mab isn't trying to change Harry. Harry's defining characteristic is his Will, he has overcome dozens of foes that should have beaten him, but he is still around and doing his thing. Mab is forcing Harry to make hard choices and make sacrifices, all while knowing Harry is going to fight her every step of the way. Harry is a knight worth Mab's trouble because he won't cave to Mab's desires. In Cold Days(?) Harry says something to the effect of, "You can't afford a mediocre knight" sorry don't have the exact quote at hand. Most every knight before Harry has been a mindless thug (yes, there are exceptions but not many); Harry won't get to this point because of his Will. Harry Will's himself through big bad after big bad, not because he is the strongest or the smartest in every fight but because he believes it is right and those big bads need to be put down or because it was Right. By Mab pinning Harry into corners and making him make choices, she is sharpening his Will and focusing him on her enemies and on what she thinks needs to be done. Harry will and has gone along with this because he realizes that even though Mab is evil, she is the evil humanity needs. Harry will continue to face down Mab's foes because it is right, and he will come out on top because of his strength of Will, and it's what he needs to do to protect his family, friends, and world. A tangible example of this is when Harry describes "fighting" Mother Winter in CD as a grain of sand against an ocean; the grain of sand can be pushed around but will not break. Harry will not break, he may need to be strengthened and supported, but he won't break or bend that is what Mab needs.

Besides Alfred’s limp comes from the Glacier which carved out Lake Michigan according to Jim/Harry, but according to science it was created 1.2 Billion years ago by the fissure of two tectonic plates

Where was this said? What WOJ or book talked about glaciers creating the limp? I don't know every WOJ but this is the first I'm hearing of this one and would enjoy hearing more about it.

The last time this question was posed, I suggested and still wonder if Demonreach can move his essence along the ley line. So you could be halfway across the world and still sent a baddy to Demonreach. We saw in BG that you don't need to be on the island itself to be snared, so there must be at least some way the Demonreach is able to extend himself beyond the island.

Haven't seen roman or Greeks. Lea is definitively Celtic, but have we seen any other named beings from the Tuatha? Their enemy fomorians have been seen. The Morrigan could be an interesting spice. And she's higher up the chain than Lea.

The Morrigan would be fun to see. But with the Morrigan being a triple goddess, there might be a greater connection to the founding of the Fairy Queen Mantles.