Eventgrid went down last year too, but came back much quicker, though it was a real clusterfuck because tickets were all gone and almost nobody got them, because the site went down while people were on the checkout page but never got to actually check out, so their tickets were "reserved". Tickets then started trickling back in but everyone was trying to get them at once, so we had to try over a couple of days to get tickets. It was very frustrating. Not sure what'll happen this time.