I hear ya, I miss a lot of things about my HTC. I don't think you can move the app drawer icon to the middle...I've tried everything.
As far as the calendar goes, there is a stock 4×4 calendar (month) widget in the app drawer that you can expand to fill the entire homescreen. At least there is on mine, I have Verizon.
Correction: you don't have to expand it. It automatically fills the entire screen, I was thinking of the bookmark widget.