The most important day in human history began, as far as the records of Civilization can tell, almost precisely like every other day that proceeded it. No storm clouds rumbled on the horizon, no portents heralded its coming, and the prediction markets for p(first contact today) were hovering at a value low enough that a less statistically literate civilization might be inclined to round it down to zero. Indeed, perhaps the biggest news item for the denizens of Schelling Point was that the anticipated 14 hours of uninterrupted summer sunlight would drive the temperature up to nearly 110 standard* and incentivize UV protection for those expecting their lives to take them out of their temperature-controlled environs.
*About twenty seven degrees Celsius, or 300 Kelvin