Per a discussion in our chat room, I've created the "activities" tag to mark questions that fall in a particular grey area: questions that aren't about parenting per se, but are about activities we participate in with our children, or support our children participating in.
The goal is that we can err on the side of including such questions even if they are borderline, as long as they are consistently tagged so that those not interested in such discussion can effortlessly ignore them.
Is the include-but-tag option a good compromise?
Do you feel another approach would be better?