I've got a custom publish type using WordPress 3. which has the next rewrite rule:

'rewrite' => array( 'slug' => 'events', 'with_front' => false )

which provides the next: domain.com/occasions/my-awesome-event/

How do i pass some information in to the rule, like the date, I am wanting to achieve the following rewrite: domain.com/occasions/2010/my-awesome-event/

Thanks.