When I was in high school, I was forced to write software to manage sporting carnivals as a major project. Anyway, if it's of any use to anyone, here it is, under the GPL. Please do tell me if you use it or alter it, though - it's nice to know :) The code isn't of a very good quality, (c'mon, I was in high school doing an assignment) so modifying it may be 'interesting'.
Update (Aug 2010): I have packaged new versions with a couple of minor bug fixes and have made the source code much easier to work with and build installable packages from.
- Computerised Carnival - Installer for Primary Schoools
- Computerised Carnival - Installer for Secondary Schoools
- Computerised Carnival - Source (Visual Basic 6.0 with NSIS Install Scripts)
- Computerised Carnival - Older Versions