Hi Ilya.b,
I visit all the Stanford GSB campus all the time and I see prospective students visiting year round. It might be that they just haven't organized the spring quarter class visits yet. The GSB academic calendar:
https://www.gsb.stanford.edu/calendar.htmlshows that classes will be in schedule when you plan to visit. So I'd just email or call them (after they return from holiday break) to ask them. The person in charge of scheduling is Madison Kawakami, Admissions Coordinator
You might also reach out to officers of one of the student clubs
https://www.gsb.stanford.edu/admissions/ ... clubs.htmlto connect with more students in your interest area.
This year they've also identified on some students who are fair game to contact --their information is public,
https://www.gsb.stanford.edu/mba/DITL_FQ2011/As for HBS, like the GSB, they are likely to be able to accomodate you informally if there are no formal sessions (which I doubt -- when I was there, we had stuff going on thru the beginning of May).
Here's the HBS academic calendar:
https://www.hbs.edu/mba/registrar/pdf/ec11-12.pdfYou will be lucky to see students in a less stressed mode (more or less) during that time of year. You'll really get a sense of the best of what the schools have to offer.
Hope this helps,
Betsy Massar
Author of Admitted: An Interactive Workbook for Getting Into a Top MBA Program
https://www.admittedmba.com