A great tip for keeping flies at bay, cut a lemon in half and add cloves to it. Set out in bowls about 30 min before food will be going on the table. The smell with leave your party pest free (at least the little kinds).
Downey Unstopable Scent Booster Beads keep Flies away from Everything ! We put them in our Garbage Cans to keep flies and maggots off our trash and in our Garage!!!! We have had rotten garbage in our can for a week with no bugs!!!!! TRY IT!!!!!