Anarchism
I would say “mark your calendars”…
…but some critical details are lacking. The Canadian Magazine, in 1902, included a short item on the origins of anarchism, which included these details: “The professional anarchist is a loafer and an idler, a gambler and a lover of dark living. Once a year a great anarchist gathering is held on Long Island, New York. The leading sport at the latest gathering there was shooting with rifles at targets made to represent the crowned heads of Europe.”