Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
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.
Anchor CMS - Free and lightweight blogging system
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Textpattern - Textpattern is an elegant content management system that is free, open source software.