Diaper derby: The South Shore Plaza will host its 4th annual Diaper Derby on Saturday from 10 a.m. to 1 p.m. Participants must be crawlers under the age of 12 months and must not be walking yet to race against each other. Prize giveaways from South Shore Plaza retailers. Registration and participation are free. To register, parents or guardians must visit Guest Services on Level 1 at the mall. For more information, contact Jillian Kuzyk at 617-488-2876 or firstname.lastname@example.org.