Finnish symphonic rockers NIGHTWISH have checked in with the following update:   "Atlanta's second show (September 13th) is sold out! Many others expected to sell out soon (first Atlanta show, NYC, Columbus...). Also, for Chicago on Sept 24th, there is a special promotion to run on Enterthevault.com that will sell 100 General Admission tickets for only $20. This is to our fans only and designed to get the less financially fortunate a chance at tickets for the biggest venue on t...