Robots, K-nex and Lego attracted hundreds of youngsters to a creative technology event in the city.
Creat-A-Con was staged at the Queen's Building at De Montfort University on Saturday.
Kate Knaggs, a teacher at Roundhill Academy in Thurmaston, took her children to the event.
She said: "My son Luka really enjoyed working with the materials available including Lego.
"There were hundreds of primary school-aged children there in the morning.
"The secondary students went along in the afternoon."
A spokesman for the organisers said: "Creat-A-Con is supporting the goal of inspiring young people to take up further education and careers in the core areas of science, technology, engineering, and mathematics.
"We hope that we can encourage greater participation in the local groups and university societies, and turn Creat-A-Con into a platform to promote these various groups to the wider community."
During the event youngsters could get hands-on experience with robots, 3D printing, Minecraft, K-nex, and building Raspberry Pis - credit-card sized computers that plugs into your TV and a keyboard.