The user just needs to enter the unique ID of the calendar in the plugin parameters in their profile. You can set a default calendar and time zone, and individual users can set their own time zones and calendars as well. This plugin comes with English and Dutch language files. Tested on Joomla 1.5.14 with Community Builder 1.2.1. It should work with or without legacy mode on. Should function in Joomla 1.0 too, though multilingual functionality probably will not work.