We generally do not assign specific projects at our events.
Students decide on their own projects at the start of each CodeDay, and our mentors provide individualized support to help them achieve their vision (or at least get close).
At CS Fairs:
CS Fairs provide a variety of workshops, most of which walk students through a simple project to spark their interest in a specific area of technology. Students will not receive a grade or any specific record of completion from these workshops, however.
Please check your region's individual CS Fair website for more information on workshop offerings.