Hotel prices near the venue for Big Bang's upcoming 20th anniversary concert have risen to up to three times their usual levels, local reports said Sunday. Accommodation rates near Goyang Stadium in Gyeonggi Province have risen sharply since tickets went on sale on June 25 for the group's three-day concert on Aug. 21-23. Hotels and motels near Daehwa Station — the closest subway stop to the venue on Line No. 3 — are charging more than double their usual prices for the concert weekend on online b