Booth & KelloggGoogle Maps displays a distance of 22 miles / 41min driving.
Booth has got info sessions followed by campus tours Mondays & Fridays from 10:30am - 11:30am.
Kellogg has their info sessions on Mondays & Fridays starting at 2:00pm.
I believe I could manage both schools on one day, arriving at Booth earlier to have some 'private time' and staying at Kellogg longer after the info session is over.
Harvard & MITThey all seem to love Mondays & Fridays

Sessions at both schools available on 11/July, HBS begins at 1:15pm, MIT hasn't announced the time on their website yet.
Columbia & NYUAs AjMBA noted, they're just a subway ride apart.
Both have sessions on 8/July and 10/July.
CBS sessions begin at 1:30pm or 1:45pm, NYU sessions begin at 4:00pm.
Columbia has MBA Info sessions on Mondays and Student Chats on Thursdays.
According to their calendar these student chats also take place during the summer, which is great!
I plan to spend an extra day in Chicago to spend a little time in the City and another two days in New York, to see a little and meet some friends, now that I'll have finally had the chance to fly over there.
The only school in such agenda, which I'm missing, is Yale.