According to Oregon law, you can't mix marijuana and liquor use in a public place where liquor is being served. That means recreational marijuana is verboten at bars. It's also not allowed at places such as breweries, wineries or any other business that is licensed to and does in fact manufacture alcohol.
The law limits your use of recreational marijuana at special venues where alcohol is being served. Have a bar -- open or otherwise -- at your wedding? No recreational marijuana allowed. You cannot sell or consume recreational marijuana at these locations or events. Individuals are allowed to have on them one ounce of recreational marijuana if they aren't using it. One ounce is the legal limit in Oregon for personal possession.