My whole life I've gone to church Sunday morning and Sunday evening.
My parents took us to church and Sunday school on Sunday morning, and they always took us back on Sunday evening. We even went when the Bears were in the Super Bowl. The crowd was much smaller than Sunday morning, but there were always people eager to be there.
Over the years, the evening service started to feel less like a "real" service as preaching became less prominent. We'd watch a video for a month or combine with another church for the summer or try small groups. I have nothing against videos (in their proper place), joint services, or small groups. But at the time they all seemed like efforts to keep up the tradition of the evening service without putting forth much effort....
For a second, I thought they were referring to the Saturday night service. I've noticed many churches offer them as a way to get more use out of their buildings, parking lots, etc, and a lot of attendees like it because it clears away their Sundays to pursue their own interests, like eating out, visiting parks, playing golf, etc. I've noticed the parking lots of coin laundries are packed on Sunday mornings.