Baltimore-Washington International (BWI) is the most convenient and recommended airport. BWI is located about 25 minutes away from the hotel by car.
Dulles International (IAD) & Reagan Washington National (DCA) are additional options , but are far more susceptible to beltway traffic to and from.
Can I stay at a different hotel than the Merriweather Lakehouse?
You are welcome to stay wherever you would like but it will be up to you to plan for your own transportation to and from the event. Uber/Lyft/Taxi's are readily available in Columbia, MD.
What should I wear to the wedding?
The wedding is Cocktail Attire. See below for recommendations for women & men.
Women: a short dress or elegant separates—as long as they're still dressy. Avoid styles like sundresses.
Men: a tailored suit (with or without a tie)