Hey Simon,
I’m sorry this is happening on day when your client expects something, we will do our best to work quickly.
Unfortunately, if this is related to network connectivity issues there may be little we (or Eventbrite) can do.
Can you confirm though if this happens consistently for all events that are imported from Eventbrite – or does it happen on a random or sporadic basis?
Also, when you mention things working a day or so ago, what sorts of changes have you made on your site since then? Any options changes, new plugin/theme installations, or removals, or server/database migrating, anything at all?
Thanks,
George