Although this was picked up by a user in this thread already, we have an update from the dev. team on this topic that we'd like to share.

First of all, please accept our most sincere apologies!

We are urgently looking into countermeasures to address these issues.
That said, we will need to confirm that any fixes do not affect any other content or processes, as this could potentially lead to issues that could render FFXIV unplayable over the weekend.
We need to be very careful with these tests, so we expect the fix to be ready at the start of next week at the earliest.

Once the timing and details have been determined we will be sure to update you all!
Once again, we sincerely apologise to everyone who has been looking forward to this event.

We are working with all haste to address this. Thank you for your patience!