Throw a Stick of Sage into the Firepit/Bonfire. The sage scented smoke that the fire will emit keeps mosquitos and other annoying bugs at bay for the entire area. Usually the sage stick is enough, no need for bug sprays.
Mosquito trap - Cut top off 2 liter bottle. Invert cone inside straight part of bottle and glue together. Add 1 tsp yeast and cup sugar to luke warm water, and pour in bottle. Mosquitoes are attracted to the carbon dioxide produced