My wife and I moved to Wausau, WI for her residency. Granite Peak is pretty much in our backyard. It's a midwest "mountain" but it does the job. Extremely nice to get out for an hour after work.

Many of the midwest hills near major cities have night skiing nearly every day of the week.

Steamboat is probably the most well known "big resort".

Mt Hood is about 1.5 hours outside of Portland, OR and has good night skiing.

I have done night skiing when I worked in Detroit.

Brighton, UT has some night time skiing (I think until 9 pm).