Ideas for what to bring to a cookout

J

My moms 60th birthday is in two weeks and I have to bring a dish to pass but I don’t know what to make or take. I don’t go to cookouts like ever, so I have no idea what is a good idea and relatively cheap. My sister already has these things covered…potato salad, queso dip, veggie tray, pork butt, chicken Spiedies. And cake. Any help appreciated!