There used to be a list on plasticseducation.com, but it got taken over by bots so I couldn't access it for you. I do know that Georgetown's first date was 11/22 and I think MCV and maybe Ky had one the week before then. It really doesn't matter because they'll schedule them whenever they want. This year, Salt lake's was on 12/18 and last year, it was 01/30 or 31. You can't go on last year's schedule because they'll schedule whenever is convenient for them and doesn't matter if the applicants can make it or not. This year, Hopkins, Mich, UTSW, and U Chicago (I think it was them) were all on the same day so a lot of people had to pick.
Most were in Dec-Jan with Mich state on 2/6, Cornell on 2/13, and Oklahoma on 2/18 (or something like that). Definitely take Dec and Jan off if you're expecting more than like 5 interviews!