Calendar and organic group(og)

Source: http://drupal.org/node/679808

Edit the View to show Events related to the current group only:

Edit the "calendar_custom" view we created earlier.
Add new Argument "Organic groups: Groups" (for posts) and click Add. Change:
- Action to take if argument is not present: Provide default argument
- Default argument type: Node ID from URL
You can also add:
- Validator = Group nodes