The majority of slips and trips are caused by obstructions in the walkways, or uneven flooring. A safe floor has no unexpected changes in level, and no damage to surfaces. Checks should be made to ensure carpets are securely fixed down.
Have you thought about other factors like good lighting, distractions such as loud or unfamiliar noises and the effect of the weather, e.g. ice, condensation, or rain?
Tape down carpet runners and wires in Church