For most events, you will need to have a response kit. Typically, these kits should include:
First aid equipment - plasters, dressings, bandages, etc
BLS equipment - AED, OPs and NPs, BVM, suction, etc
Trauma equipment - tourniquets, blast dressings, etc
Diagnostics equipment - BP cuff, thermometer, sats probe, pen light, etc
You may also need:
Oxygen - CD cylinder, high flow masks, simple masks, nasal cannulas (for both paeds and adults)
Drugs - EMTs and Paramedics/HCPs only