I run a local portal, and we have many events.
We use WP posts to create a nice write-up about the artist, venue, and where to purchase tickets. Then, I have to go to the calendar plug-in, re-write the post in order to create an event.
It would be cool if there was a meta box (or check box) to "add this post to the calendar" on the WP post page.
Also, since I'm writing a post about the event, I would love an option to link back to the original post (rather than the second post) from the calendar.