When you're cooking on the grill, be sure to check the temperature of the meat. Just because the outside looks good doesn't mean the inside temperature is high enough to kill bacteria. Marinades give grilled meat a nice flavor, but if you want to baste the meat while it cooks be sure to have fresh marinade. The marinade you used for the meat can have bacteria in it and isn't a good choice for basting. If you're serving potato salad or cheese potatoes, remember to keep them at the right temperature until it's time to eat.
Protein foods can spoil very easily when left to sit at room temperature.
So enjoy your first grilling of the season, but also take a little time for safety.