The sun launched a powerful coronal mass ejection toward the Earth on 23 March 2024. This caused a severe (category G4, the maximum is G5) geomagnetic storm that spanned from 24 to 25 March. The NOAA National Weather Service issued a warning of “increased possibility of anomalies or effects to satellite operations”. Aurora chasers geared up for increased activity. Magnetic observatories saw large (3000+ nT) variations, particularly in the horizontal component of the Earth’s magnetic field, and particularly at high latitudes. A NOAA CrowdMag volunteer recorded awesome magnetic variations using a cell phone in northern Alaska. Large geomagnetic variations can also cause stress for animals, such as birds and fish, that sense the magnetic field for navigation. Studies have shown that even some humans experience measurable physiological effects from magnetic field disturbances. This poster summarizes the 23 March 2024 event and serves as a gathering place for discussing the effects of extreme geomagnetic disturbances.