When planning activities for a bonfire party, pick up some sparklers and other fireworks and set out some edibles that guests can warm up on the fire, such as marshmallows with metal coat hangers for roasting. Pick some songs that everyone knows when things wind down.
When you're planning fireworks around the bonfire, make safety your first concern. Pay attention to the direction in which the wind is blowing, and if it's moving from the fireworks toward your guests, make sure there's plenty of space between them and the bonfire -- and the fireworks. Make sure that the stakes holding your fireworks are set firmly in place by pushing on the stakes. Set some buckets of water close by in case something catches fire.
Put some marshmallows and some wire coat hangers that you have already straightened out for your guests. Show younger guests how to hold the marshmallows over the fire until they are just black but not burned beyond what they can eat. Kids usually enjoy watching the marshmallows catch fire briefly before going out.
Once the party starts to wind down, start sing-alongs with classics that your guests are likely to know. Don McLean's "American Pie" and Neil Diamond's "Sweet Caroline" may appeal to baby boomers, while Poison's "Every Rose Has Its Thorn" and Oasis' "Wonderwall" are well-known to their kids.