Productivity Mashup has invented something called Kanban Calendar, which is a mashup of several of their favorite productivity systems. They’ve applied the concept of Kanban Calendar to WorkFlowy, and you should check it out. The video above is one of a few from the article showcasing the system, so check out the article for the full treatment.
http://www.productivitymashup.com/blog/2014/8/17/kanban-calendar-workflowy