Lemon grass is a natural mosquito repellent and grows quite tall. Plant some in deep planters and place on the patio or where you will have people sitting and you will also have a privacy hedge with the added benefit of being a natural bug barrier.
Put 4-5 stalks in a deep pot and plant it at least 1/2 way into the ground for stability. Place the potted lemon grass where you will be sitting so that the breeze blows over its aroma towards your guests. The mosquitos won’t bother anyone when they are around.