LEGO® Store Monthly Mini Model Build for children ages 6 to 14 one per child – LEGO® UFO: Tuesday, April 7 starting at 5:00 pm and while supplies last. Ask for a brick specialist. Visit your local LEGO Store the first Tuesday of every month and your child can learn how to build a cool mini model, and take it home – for free! Quantities are limited. Need to find a LEGO store near you? LEGO Store Locater.