I think the longitudinal study may be in order to see if this event really makes a difference to gender balance. From the ASEE aggregator:
Newsday (2/23, Ferrette) reported the New York Institute of Technology in Old Westbury held “Introduce a Girl to Engineering Day” last week. The goal of the NYIT event was to get more girl interested in engineering. Organizers of the event said it brought the girls “into the college engineering pipeline.” The Stony Brook University, Hofstra University and Farmingdale State College said they see some progress enrolling girls in their engineering programs. Officials at the engineering schools credit “high school science camps and other programs that support young girls.”