no, they’re not showing up in the events list in admin. no idea where SEOmoz is finding them, but google webmaster tools isn’t listing them as duplicate content for me (and i can’t get them to show up in google search results). webmaster tools will, however, fetch those urls – in fact it will fetch any url in the /events/yyyy-mm-dd format.
i guess this might not be a functional problem with the plugin – just something i’ll have to wade through in SEO analytics…?