Closest approach by asteroid Apophis (300m diameter) - closest approach by any potentially hazardous object (PHO). Will be visible to observers on the ground WITHOUT (edit) the aid of binoculars.
Eyes on asteroids - https://eyes.nasa.gov/apps/asteroids/#/home
https://cneos.jpl.nasa.gov/doc/apophis/
https://science.nasa.gov/solar-system/asteroids/apophis/
What a date for a doomsday asteroid
https://en.wikipedia.org/wiki/99942_Apophis