If any firework fails to go off, dont go back to it. Half an hour is the absolute minimum time to wait before you consider approaching it again. A sudden change of wind could cause aerial fireworks to fall dangerously among spectators. In very windy weather, you should consider putting off the display altogether, however disappointing that might be. Bonfires need a lot of organising and can be a hazard.
Many displays are a great success without one.
If, after careful consideration, you do decide to have a bonfire, make one person responsible for it, from early planning to final clearing up. Dont site it too near your display or firework storage area. Never use flammable liquids like paraffin or petrol to get it going as this can result in uncontrolled spread of fire or explosion. Check immediately before lighting that there s no animal or even a young child hidden inside. Never put fireworks on a bonfire even if theyre dead.