GCalendar is an event calendar module for PHP-Nuke. GCalendar features: monthly, weekly, and daily views; repeating events; user submitted events with optional admin approval; CSS to customize appearance; printable views; support for international date and time formats and more.

Release 1.7.0 adds NSN Groups support to GCalendar. You can now control who submits events by group; specify which groups do not need event approval; and assign event categories to groups. 
A new force center option has been added to force center tags around the blocks (needed for some themes). 
The way GCalendar handles languages it does not support has been improved. It will now default to the English language files if it cannot find the appropriate language files.