Social wasps, the species that live together in nests, are certainly an irritant, spoiling the pleasure of drinks on the patio and food from the barbecue, they also come into the home looking for sweet treats. And last but certainly not least some people are allergic to wasp stings.
Sprays are effective against individuals but for everyone that is dealt with others will appear.
Treatment and control
Seek out the source
Find the nest. Wait for the evening when the wasps have stopped flying. Place insecticide dust containing bendiocarb (******) in the entrance to the nest. More than one application may be required.