The free event is scheduled from 11 to 1 p.m. in the South Pasadena Library Community Room.
Lego Mania encourages children to use their imagination and apply science, math, and engineering to create and build with Lego blocks. Children three years and younger will learn through play with Duplo blocks.
The South Pasadena Library Community Room is at 1115 El Centro Street. For more information, call (626) 403-7358.