My school had a kyushoku schedule for each month -- I bet there's a chance you either just didn't receive the schedule or couldn't read it?

I have to admit that sometimes even though I could read it, I'd have no idea what the heck something was going to be anyway. But usually I knew what stuff was, and so if I said "Hello everyone, how are you?" at the class start and someone said "I'm hungry," I'd often say "What's lunch today?" and we'd look at the schedule and it'd be like "Do you like curry and rice? Who doesn't like curry and rice?" and so on as a class conversation starter...