Our mosquito problem wasn't severe, but we had a lot of luck with a simple outdoor plug-in unit. It runs an IR light source to attract them and uses a fan to capture them in a basket. Some more expensive models also use CO2 to attract mosquitos, but I didn't want to deal with bottle replacement. I just plug it in during the spring and put it away once the temp drops below freezing on a regular basis.

We set it up on the opposite side of our yard from where we gather. Even if it's not catching all the mosquitos, it gives them another area to congregate. It seems to work well for our yard and scenario.