The 67 are going to be caches which have been submitted for review, but can't be published yet. Some of those may be Events, but it's impossible to tell at this stage.
Cancelling an event won't count towards a Hidden cache.
Speaking in terms of what has happened in New Zealand (which may be similar to the approach from UK reviewers), we were still able to submit caches for publication, especially if they were types that didn't require handling such as Virtuals, Earthcaches or Adventure Labs, but that they simply wouldn't get published until we went down to our alert level 2 at the earliest.
But by submitting a cache for review, that allowed some of the donkey work, such as co-ordinate checking, to be done by the Reviewers in advance so that they would be able to publish new caches more quickly when allowed to.
Hope that helps :)