In most cases people coming direct from the USA do have to come in a day early. We arrive at midnight on March 8 have our air tickets already.
So many come in two or three days early or do some other travel in Europe and can get in earlier in the day. SO officially we are starting on March 9 but if your flight is too late then come in on March 8.
SUNSET private sound and light show before the regular shows begin.
I will shoot out an email to people and let them know this as FF miles with BA are out now but they come out earlier than most other carriers.