[Sigia-l] best practices for Events Calendars?

[Jackson, Eloise]

I'm working on IA recommendations for a large government website to expand the functionality of their "Events" pages.   There are many different types of events (training, conferences, trade shows, workshops etc.) held in many different places across the States for many different audiences (govt employees, vendors, customers,local, regional, national etc.).  

Can anyone offer guidance on best practices for presenting Events, registering for them, and the calendar functionality that is part of the process?  Also, examples of good sites offering this would be appreciated.

many thanks