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.
Even outside of a venue where alcohol is being served, your use of recreational marijuana might be limited by other laws and regulations. Local jurisdictions within the states have different rules for using marijuana in public places, so it's important to know where you are and what the rules are. Even in a private setting, smoking marijuana might be governed in some way by the state's Clean Air Act.
You also can never receive financial consideration when you pass recreational marijuana along to another person in the form of a gift. If you are providing recreational marijuana at your event, then you can't accept tips, host a fundraiser, charge for admission or even accept donations to help you cover the cost of food or other items at the event. You should also be very careful if you have any type of paid staff for the event. If you have questions about whether your use or event flies in the face of recreational marijuana laws, consider speaking with a lawyer to understand your rights and the law.
Source: Oregon Liquor Control Commission, "Recreational Marijuana Consumption, Gifting, and Giveaways," accessed July 22, 2016