Finally, I’ve been reworked wp-cat2calendar to something new, hope so you like it. (first picture)
Now it looks like something you’ve seen before on a different websites, it’s funny but not so much. This version is more compact and beautiful than before, now your posts (events) goes over calendar in a popup and this popup contains a post titles and excerpts. If you’re filled your post excerpt so it will be used in the popup otherwise excerpt will be generated automatically from the post content.
The final idea to make it more cute like on the second picture below, so next release will contain redesign again 
great an individual writing involving