The Museum's free Speaker Series offers its 20th year, presenters covering a wide range of aviation and space topics.  The Series begins in April and continues through November on the second Wednesday of each month at 7pm, except when that day is a federal holiday.  These presentations, held at the Lockheed Martin Auditorium at 2323 Eastern Blvd. in Middle River, MD are FREE and open to the public. A photo ID is required for entry into the facility. Children under 18 must be accompanied by an adult.