Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
TiddlyWiki - a non-linear personal web notebook
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Confluence - Confluence is content collaboration software that changes how modern teams work