So when you asked if we had a plan for how to keep bugs off our guests, I think my first thought was that I'm the best bug repellent anyone could ask for. They all fill up on me and leave others alone. But obviously we needed a better plan than that, particularly since my parent's have a creek in their backyard that creates a larger than normal mosquito population.
The first thing we did was to have the torches we used to light the yard contain citronella oil. Not the most pleasant smell, but it served its purpose. Second we set up a small table of bathroom supplies near our toilet (tampons, lotion, condoms, and...bug spray). We bought a natural, non-cancer causing, reproductive-harm-inducing, spray from our natural food co-op.I've tried several natural bug repellents and All Terrain Herbal Armor is the best that I've found. I even took it with me when I went to the jungle on my honeymoon and stayed (mostly) mosquito bite free.
So that's what we did to keep the bugs out. And for the most part it seemed to work. I didn't get a single bug bite all night!