|Not this sort of post|
It did very well in America as well: "The US broadcast of The Day of the Doctor was watched by an average of 2.4 million, a record for BBC America. Despite having a Saturday afternoon slot in the US, the show achieved BBC America's best ratings, with a peak time repeat upping the total to 3.6m." The day-of theatre showings seem to have all been solidly booked, if we're to correlate a line about "events sold out in 11 different cities" with the 11 American cities that participated in the simulcast. Simple maths, that.
(Of course, we have to take some of this with a grain of salt - people would have known that this isn't going to be in theaters indefinitely and might have all piled up in a way they wouldn't have for a normal theatrical release. Still, it's quite a good sign all told.)