Hi Chris, it's fun and all that but is HN the best place for your marketing efforts? I'm not sure that, as a group, this is a paper based calendar audience - even when the sheets are quite large.
Weak vote for B. It's clearer at a glance to me what day I'm looking at. The space doesn't feel wasted.
But I'd prefer some grid layout, with huge numbers, and lots of space for writing.
Someone needs to setup an OKCupid "MyBestFace" style website where you can upload things for testing. But please use many more votes than OKC's MBF uses - 20 is paltry.
good luck with it though.