This free event has ended, but find upcoming FreebiEvents here. This Saturday, June 28 attend a free Transformers Build & Demo Event at Toys R Us from 12-2 pm or while supplies last. Build your own Kre-O Optimus Prime riding Grimlock figure. Plus, demo the new Transformers One-Step Changers & Battle Master and get coupons to use in store that day! This event is intended for children ages 5+ and parental supervision is required at all times. Please check with your local Toys R Us for participation.