If you are going to have a party, toss pieces of dry ice into a ditch a few hundred feet away. They go for the carbon dioxide in your breath, the dry ice provides plenty of that, makes them head for the source.
Some have good luck with the traps, some don't. And there are some possible reasons for the disparity. For one thing, wind direction. If there is a very gentle air movement sending the machine's attractant, but the mosquitoes heading for it find you before they get to it, you would be saying that it isn't doing the job. But if the neighbors on both sides of you use them, you would be saying you don't need one.
Most anything that makes carbon dioxide can serve as an attractant, even the family dog. If you decide to get a device, be sure to decide where your prevailing winds come from, and if wind speed is 3 miles an hour or more, turn the unit off to save gas.
Also, consider taking 100mg. Vitamin B before you're going to be in the yard, especially during the evening. And Avon Skin-So-Soft might not be a bad idea, either. Neither are going to hurt, might help.