In my humble opinion, I would advise that you don't try anything like that. I mean, let's think about it this way: Medical schools are more open to people who really want to go to their school and show that interest by interviewing and visiting. You probably don't want to ask the school "Would you mind interviewing me on Monday because they're interviewing me on Wednesday" because they are yet again reminded of how they're not the only medical school. Speaking from experience, medical schools don't like that. You might as well make up an excuse or something to move an interview. Good luck.