Hi Karen!
Welcome to planDisney! I am so sorry that you are having issues booking
Savi's Workshop - Handbuilt Lightsabers for your grandson. Having returned from an adventurous trip to Batuu at
Star Wars: Galaxy's Edge, I can personally attest to how popular this experience is! Being able to put together your own personal lightsaber, from hilt to the all-important kyber crystal is something that I'm sure your grandson will remember forever. Not to mention, with the assistance of the Gatherers, being able to bring the unique lightsaber 'to life.'
Karen, I checked the dates of your arrival, and I was able to open up the
Savi's Workshop site, and there were several times available for the morning afternoon, and evening for selection. I was able to open up the page on both the website and the app. My suggestion is to perhaps clear your cookies, or utilize a different browser, which might help in resetting your selections. If you continue to have trouble, they do have some same-day reservations, so you can head to the theme park and inquire if there is availability for the duration of your stay.
I hope this helps you plan an incredible trip with your grandson to the Happiest Place on Earth!
Malanie