If you're coming to Mill for Friday or Saturday night, Cue Club is a great place to start. The drinks are pretty cheap and the atmosphere is great. It is pretty crowded when you first get in but as you get further back, it's easier to have a conversation and enjoy a drink. Several different types of beer, bottle and tap, including some crafts.
I like Cue Club because it has kind of that divey, pool hall feel, but it's right on the main drag of Mill. The crowd is definitely 21-29 and mostly ASU seniors or grads. Expect to wait a few minutes in line before getting in (unless you fit a criteria to skip the line altogether or pay the door gal to get right in).
I have been to cue club probably 20+ times but never before 6pm. I highly recommend stopping by here during some part of your night.