One of my favorite HEY features is the integrated calendar that takes the default "yes, no, maybe" invite conventions and actually presents them in visual context so you can make an informed decision. When you get an invite in an email, HEY renders that day, that event, and any other events you have that day right below the email. It shows you where it'll fit in context. I don't have other events this day, but if I did they'd show up there too. Everything's clear, colorful, contextual, and…