Nobody in our house is required to learn about Greece. The sheet goes up on Sunday. Maybe someone will do an activity or two. Eventually somebody asks what feta actually is. By Thursday there's a mess in the kitchen and we've watched a man climb 272 steps to a cave.
Teachers call this incidental learning. It works on grown-ups too (trust us, we know).
Does it work every week? No. Some weeks the sheet just hangs there. That's fine. COTW has no rules. It's not Kumon!
And when we can, we go. Some weeks the country arrives with our own photos and videos from the ground, sent while we're still there with the backpacks on.