You could rent a locker for the droid, opt to have the items shipped back to your home or take a break and return to your resort or car. Otherwise, you’ll have to pack them around all day.
We purposely set our appointment times late in the day. For the droids, we did the last appointment, then left the park. For the light sabers, we did an appointment right before dinner. Then, it was dark and we were able to take pictures. We even found a Disney Photopass photographer and got some great pictures of the kids!