The first time I heard the term burger burn was when I lived in Ohio. I have always referred to something like this as a cookout. Some people call it a BBQ. Our squadron booster club decided to do a burger burn as one of their fundraisers and I offered to make a flyer for them to share with everyone.
I wanted to find a fun background featuring burgers. This was harder than I thought. I actually found a lot of cute backgrounds, but a lot of them had watermarks on them. I am cheap and do not want to buy images. But I found this black and white burger background which worked out well and isn't too distracting.
Copperplate Gothic Bold