We were there last week as well. We went to MK on June 21, and got fastpasses for Space mountain. One thing led to another, and we never made it on it. On June 22, we went to MK only at night. We took our fast passes up to Space Mountain, and asked the CM if we could use these. He said they are not suppose to let us, but he said it was ok, if it was ok with the lady further down the line. I think he was refering to the CM who was monitoring the line close to loading area. Nothing was said to us, and we all rode the ride, that was including a baby swap as well.