This exploratory study examines how modifiable venue characteristics relate to nightlife sexual harm. Researchers conducted 35 covert observations across 18 nightlife venues in Geelong, Victoria. Observers recorded venue lighting, decibel levels, crowding, and incidents of sexual harm. Sexual harm was observed in 37% of observations. LUX was an ineffective measure of lighting; however, observer-rated lighting showed a strong negative correlation with sexual harm, indicating that darker venues were associated with more incidents. Sexual harm correlated moderately with decibel levels and strongly with crowding. Venue design changes that enhance visibility and reduce crowding may improve patron safety and increase intervention opportunities.