My children are caught between being leaving behind the Sunday School age and not yet in the' youth group' age. In an effort to find an alternative we went to the evening service.
The attendance was OK, but mainly 20s to 30s, a very few older middle aged and one child in the group of my children.
We missed the mark! Too old for them (I should not have been surprised).
I also found the visual atmosphere unpleasant: not enough light. It struck me as a space that grew darker when the lights were switched on.
If people find the space unattractive, or even worse, unpleasant, they will be reluctant to come; some won't even know why they are reluctant to come, but will tend to stay away.