In Seattle, private bars must comply with the state's liquor laws, according to which alcohol can only be served from 6 am to 2 am daily. These laws also require that the bar, or the caterer you hire, holds a liquor license to serve alcohol. Additionally, serving alcohol to minors or intoxicated persons is strictly prohibited. Therefore, it's quite important to discuss these regulations with your venue owner to ensure a smooth and lawful event without any unnecessary stress! You can find more detailed information about regulations in Washington here.