BlackFinn is a good lunch option in the Epicenter. They are fairly quick and have an extensive menu. My favorite dish on the menu, and one of my favorites in Uptown, is the ahi tuna salad. It is done with a ginger vinegarette. Great way to take a break for lunch.
I've also been to work functions at night. There are plenty of private areas that they can give according to the group size. They will also lay out a nice spread with a large catering menu.