He can be in Mickey's house. There can be up to four different Mickey's at a time who meet behind different doors. I think it's sorcerer Mickey, bandstand Mickey, regular Mickey and steamboat. At least it was a few years ago.
What we did was find a cm at the head of the line in the cartoon clip room, then we asked quietly if steamboat Willie Mickey was meeting today. She said yes and we asked if we could wait until that Mickey was ready for guests. So we stood aside with her and actually had to wait quite a bit longer until they were ready to load his room. But we did get to meet him.