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The calendar isn't in a Wordpress installation, it's in a custom CMS.
What was happening was whenever you click a date, category or date range, you'd get the same URL with parameters (calendar.html?year=2014&month=10&day=23). We've modified that template to be canonical to the main calendar page, so hopefully that will address duplicates there.

When you click a specific event title, you get an event page with an event ID parameter (event.html?evid=1960). We've modified that template to display the date and event title in the <title>tag and a truncated description of the event in the meta description, so hopefully that will treat each event as a separate page with its own content.<br /><br />But we really do need to separate the subdomains from our reports, as the wordpress installations are throwing up duplicates for a lot of items, attachment posts, etc. This will be fixed with relaunches of those subdomains, but for the time being it sure makes hunting down actionable items on our main domain difficult.</p></title>

Our site suddenly shows over 150k issues, where previously it was a few hundred. I suspect a lot of these are due to the way our event calendar is set up, which we are trying to rectify (perhaps URL parameters being treated as separate pages) but lots are also due to subdomains suddenly popping up in our Moz reports.

We currently have the subdomains (blog. and corporate.) set as separate campaigns, so don't necessarily want them showing up in our main domain campaign. They're Wordpress installations which need to be heavily revamped to address their own issues, but that's beside the point. Is there a way for our main domain campaign to be exclusively just that domain?

Edit: Perhaps I should mention that Google Webmaster Tools reports only a few hundred HTML improvements--not nearly the 150k+ duplicate/missing title/desc issues that Moz points out. Side thought, does Moz not know if a page is set to canonical and will report that page as duplicate anyway?