Keep flies AWAY from outdoor parties! Use lavender oil on a sponge & put it inside a can with a lid 24hrs prior the party. Open can & enjoy your food w/out flies flying all over your food. You could make a few and spread them along your food display.
How To Keep Flies Away - jar/bag pennies and water. It's so easy to keep flies away and looks nicer than the hanging bag of water. Plus if you tried a fly trap, this is so much better and doesn't smell.