This plugin allows for the integration of a Google calendar into a WordPress blog. Specifically the door64.com Austin tech events calendar.
Create automatic plan links from your event blog so that your users can make plans on Planyp.us.
This plugin adds a widget to display your upcoming events (gigs) from Last.FM on your WordPress blog (using the hCal Microformat).
This plugin can receive iCalendar feeds from third party sites and display aggregated upcoming events from multiple feeds in your sidebar.