Students attending NWED will be challenged to build a coding machine, devise codes and the final task will be to put everything together to send messages within their team.
The event, based on the work of Joan Clarke, has been organised by PhD student Katie Winkle, who completed her undergraduate degree in mechanical engineering at Bristol and is now studying for a PhD in Robotics and Autonomous Systems at the Bristol Robotics Laboratory.
Female and male Year 8 and 9 students, who have a strong interest in maths and science, will be attending the day from seven local state schools.
There will also be presentations from Katie and her colleagues about women in engineering, to inspire and encourage women to study engineering.
Adele Ruston, Widening Participation and Undergraduate Recruitment Officer, said: "National Women in Engineering Day has been created to celebrate the achievements of women in engineering. The day will provide an overview of what it might be like to work or study in engineering, allowing students to work in teams to solve an engineering challenge.
"The day will also include further information about routes into engineering that students can take and how engineering has developed as a subject discipline."
Students from Colstons Girls School; Wellsway School; Redland Green School; Somervale School; Oasis Academy John Williams; Bristol Cathedral Choir School and Cotham School will take part in the day.