Question: Which arena, once known as the "North Greenwich Arena", regularly hosts the Country to Country music festival?
Sentence (from "The O2 Arena"): The arena was built under the former Millennium Dome, a large dome-shaped building built to house an exhibition celebrating the turn of the third millennium; as the dome-shaped structure still stands over the arena, "The Dome" remains a name in common usage for the venue.
Relevant evidence: No