Be sure there's plenty of ice in your cooler. Serve the food in a shaded area if possible and don't let the food sit out too long. That depends on the food and the temperature. Use good judgment. If there is any doubt about spoilage, throw it out.
Food poisoning is a serious danger in the summer months .
Find out and then stay away. Your local library is an excellent resource for providing photos and descriptions. Prevention is the cure for poison ivy . Be aware of what's growing around areas where young children are playing. They are often very curious about vegetation and mushrooms that can be harmful if eaten .