Who: One Direction (Niall Horan, Liam Payne, Harry Styles, Zayn Malik and Louis Tomlinson)
What: The Logies (Australia's television industry awards) red carpet, 15 April and outside the One Direction concert at Melbourne's Hisense Arena, 16 April
Bonus info: Essentially, where One Direction go, hysteria follows. Here are pictures of 1D walking the Logies red carpet, grappling with muffs and doing some slightly concerning waving. The other picture is of the hysteria in full flow.