Since the two featured events (Garbage Truck Rodeo and Kirby Derby) are somewhat similar, I’d like to mention a host of alternatives. As always, check websites etc. for details, I have not researched these events in detail.
First off, on Friday night, Historic Stagville in Durham is hosting a stargazing and stroytelling event together with the Morehead Planetarium. This event repeats fromtime to time, and I definitely want to go one day.
Secondly, Lake Crabtree County Park has a program called Creepy Crawlies on Saturday from 9a-11a (But you MUST pre-register today.) Less creepy, but also crawly is the ladybug release party at Marbles.
Another exciting event that would’ve deserved its own article (but is more for older kids and adults) is the Reenactment of events from the War of 1812, organized by the City Museum of Raleigh. It consists of a series of events at the Capitol, Mordecai and the museum itself (Not all directed at and suitable for children.)