This is a companion report to that of Indig et al. (2003). Both papers describe the development and implementation of a system for identifying and responding to potential public health problems arising during the 2000 Olympic Games in Sydney, Australia. The system was intended to measure communicable diseases and other presentations occurring immediately before, during and after the Olympics. When compared to the period of time before and after the Olympics, visits to emergency rooms related to illicit drug use increased slightly. Surveillance at one sentinel emergency room detected a cluster of three grand mal seizures occurring after ecstasy use at the same dance event. All three cases arrived within 2 hours of each other. Drug identification was not performed in urine or serum (see also Indig et al. 2003), but the authors presume the cause of these seizures to be adulterated or fake pills. No other reports of grand mal seizures after ecstasy use were reported.