Getting Calendar Link Spam

Team WPMU,

I just got an alert from Google about an a large amount of links to the site, and the list was all for links to far future events (30-600 years from now) that are actually nonexistent in the BP Group Calendar (I checked), but that use the link structure for them (an example: http://mysite.com/groups/group-name/calendar/2585/05/27/ )

These events were not actually created, they were just links generated to the calendar function -- some kind of inbound link spam, I'm sure.

Google recommends using "nofollow" links for that content, but SmartCrawl does not allow for tailoring of Calendar content links (though it does for almost all other content).

How do you recommend I deal with this?

Thanks,
Rob Mc