I suggest a month long, by appointment only, Orgy, that includes drugs drink and lots of cake, on entering you can make alterations to your body and face, like the start of Skyrim, so everyone is happy with their looks and it will encourage the old as well as the young.
Call it “The chance to meet your God and let your hair down”, police it with Tigers.
In the second week or as people seem to be tiring, introduce tranquilisers, then napalm the fucking lot, do one in America and another on the Russia-Chinese border.
Report the incident vaguely as a possible terrorist/maybe faulty gas main tragedy that the police can’t look into as they were all invited, sweeten it with the fact there are a lot of empty houses going free and the fact that all the tigers escaped.