"RS EVENT multiday" is an easy to use and highly flexible tool to manage and print events in your blog by adding the sidebar-widget "RS
Q: Is an event nothing else then an ordinary post with some (hidden) meta values?
A: Yes, it is this simple! So, just publish a post and add a date at the "RS EVENT mutliday".
Please see/search/use the comments on http://dalking.de/rs-event-multiday/
A lot of questions are answered there already (including the one above).
Futhermore, you can use the WordPress support forum for this plugin.