This one is for this Saturday, October 27, 2012 from 12:00pm to 2:00pm.
Here are the details they have printed about this event:
Receive a FREE Exclusive Monster City Mini Pack! Plus, help build a LEGO Monster City! In-Store only!
Event intended for children ages 5-up. Parental supervision required at all times. All giveaways and event materials available while supplies last and distributed to participating children only. Limit one per child. Quantities limited; no rain checks.