You can sue an event venue or catering company for overserving alcohol that resulted in a drunk driving accident. This is called a Dram Shop Case. Cases like this are often filed against bars or bartenders. Additional insurance is usually available if you can pin some liability on the event venue or catering company for overserving and helping contribute to a drunk driving crash. A personal injury lawyer can figure out who to sue after a drunk driving crash. The consultation should be free.