This Event Directoy Script has lots of cool features:
1. SEO Friendly URLs
2. Display by Month, Style or Location
month: http://www.dance-forums.com/competitions/date/Feb-2007/ 
style: http://www.dance-forums.com/competitions/style/ballroom/
location: http://www.dance-forums.com/competitions/country/uk/
3. Display Past Events: http://www.dance-forums.com/competitions/recent/
4. Submit Multiple Dates for the Same Event
5. Uses the FCKed Editor allowing for easy display of complex html pages
ex. http://www.dance-forums.com/competitions/details.php?id=83