Hi Michelle!
Thanks for sending your question to the Disney Parks Moms Panel! Unfortunately the half day passes are only available to guests attending a convention within Walt Disney World Resort. There is also an Epcot After 4 pass but those are sold as annual passes to Florida Residents only.
When I travel to Walt Disney World and arrive in the afternoon or evening, I use that arrival day to settle in to my Disney Resort and then take the transportation over to Disney Springs. This may be a great option for your family as well!
Disney Springs (formally known as Downtown Disney) has lots to offer with different dining options and entertainment experiences such as
Splitsville which is a bowling alley and restaurant. There is also a new restaurant called
The BOATHOUSE where you can have a tour of Disney Springs aboard little "dreamboats" themed like retro or antique cars! I highly recommend that you check them out.
It has been a pleasure assisting you Michelle! If I can help you with any other planning need or question, please feel free to send them my way!
Happy Planning!
Yael