I am of two minds - throw my books out the window and let the kids just do school homework and independent stuff, or double down and somehow get more efficient with after-school / weekend time.
Math: The kids want to continue Sylvan tutoring / enrichment into the school year. Sylvan agreed to help with math homework if it's a heavy homework day when they go. (Otherwise I don't see how we can fit it in.) I will help them work though math homework as needed. As long as they are doing Sylvan, I don't expect to ask them to supplement at home, except as needed to cope with the day-to-day school work. (Except I will try to do some fun stuff that is math-related.)
Reading: The school does enough here. We will continue to do audiobooks & read-alouds and the kids will attend the monthly book clubs. I have a few materials for literature that I downloaded from the net, and if we read those books, I'll see if the materials are helpful in an afterschooling context.
LA: I would like to continue with some vocabulary books I have. It depends on time constraints. I will say that their school's spelling curriculum does a good job with vocabulary. As for grammar, I have lots of stuff and we do need to work on it, but time will be the issue. I'll try to do some on the weekends.
Science and Social Studies: Continuing with the monthly boxes and magazines the kids get. Some outdoor and museum activities, some videos that I have. May use some science story books for read-alouds or weekend work. Some travel.
Cooking: we have some fun cookbooks that correlate with school subjects - math, science, social studies. I keep talking about using them. I will try to do this on the weekends.
Music: just practicing their instruments.