On my calendar (and a few others I found in this forum that had links) every month displays 31 days.
Interestingly, recurring events do not display on the day that shouldn’t display (such as the 31st of November).
Ha! Thanks for spotting that; definitely a fail on our end. I’m shocked nobody’s caught it yet 🙂 Filed this as a request with the dev team to get patched up for 2.0.2.