It would make sense to do it on the weekend so it could be done at a time for all time zones. Only issues for weekends, some of us do things on the weekends, especially Saturday. So I think the best solution is to just do it once a week on the weekends and once a week on the weekdays to include everyone.
I say that's a good idea.
We can set a time for an official CSS event day or w/e, two every week. (one on a weekday, one on the weekend)
The only problem I see with this is that people may get bored of it.