I created a new calendar add-on for concrete5 that has been submitted for review. It allows for multiple day events, with or without lightbox, events/items created from a page_list filter, a bunch of page list filters, or items you create in the dashboard. I ported this over from a vacation rental app I wrote for concrete5 with the idea that not everything on a calendar needs to be an actual page in concrete5. You have all kinds of options for recurring items, you can clone items, and items can link to another page on the web, not just a page on your site. Every calendar has a RSS feed, and an iCal link. Created events can also be associated with a page, so if you have the same event every month but at different times of the month they can all point at one single page.

Just wanted to give everyone a heads up on what is on the horizon :)