Memorizing you own speech is almost never a good idea. Reciting something word for word usually sounds stiff and unnatural, and can be a disaster for speakers who forget their place in the middle and can’t get back on track without starting over from the beginning.
But this video accompanying Ken Burns’ “Learn the Address” project is a good way to introduce kids (and the rest of us) to a bit of history by encouraging them to memorize the Gettysburg Address. Which is a pretty manageable exercise since it’s less than two minutes long and so much of the language is already familiar to most people. It’s also kind of fun to see who does well with their line readings (generally the newsreaders and politicians) and who doesn’t quite manage the gravitas (Taylor Swift) to pull it off.
You can also spend time browsing all the other videos people have posted of themselves reciting the speech. Didn’t know what Vicki Lawrence has been up to lately? She’s been learning the Gettysburg Address!