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).
If you see tiny white bugs flying around your plants... well, those my friend are whiteflies and they are super annoying houseplant pests. Want them gone? Here's How to Kill Whiteflies on Houseplants | GetBusyGardening.com