Backstreet Boys ‘Into The Millennium’ (Courtesy Live Nation)Backstreet Boys were supposed to be wrapping up their residency at Sphere Las Vegas in August, but the fans just won’t let them leave. The group has announced three new dates for their Into the Millennium residency, taking place over New Year’s Eve weekend: Dec. 31, Jan. 1 and 2. Tickets for the new dates will be available via a Backstreet Boys Fan Club presale beginning Aug. 18 at 10 a.m. PT. You can sign up for the artist presale, which starts Aug. 19 at 10 a.m. PT, via LiveNation.com. The general sale starts Aug. 21 at 10 a.m. PT via BackstreetBoys.com.