Another quick tip if you are going to be outside and barbecueing. Throw some sage or rosemary on the grill. These herbs will repel flying insects, including mosquitoes.
Mosquitoes also like still air, so using a fan or keeping the air moving will keep them out of your house.
While these tips work, keep in mind that eliminating standing water around your home is the best way to eliminate the problem. After a female mosquito has your blood for a meal, she will lay her eggs on the surface of still water. It only takes 1 pint of water to nurture 500 mosquito larvae.