Freshmeat page: http://www.freshmeat.net/appindex/1999/10/19/940375652.html
Event Calendar is an online event calendar, originally developed for use by an educational institution, based on PHP and PostgreSQL, and supporting SSL. It allows people to submit events, and other people are allowed to approve those events for general viewing. Deletion, modification, and searching are also possible. Permissions (approve, delete, modify, submit) are based on the location of the event (a given user can be in charge of one or more locations). It also has other nifty features like a preview while submitting an event, hiding events from "outside" web browsers, and the option to view unapproved events.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!