I was bored so I decided to start looking at what day of the week last year's interviews were handed out for schools I haven't heard from yet. I didn't want to go find dates for schools I didn't already have (although they are in here somewhere) so I'll let other people add to the list. I just went by the first reported interview invite from last year
Monday:
CCOM (8/24)
KCOM (8/17)
PCOM-GA (9/21)
UMDNJ (8/17)
Tuesday:
None
Wednesday:
Nova(7/22) [year before it started on 8/15 - friday]
Touro-Ca (8/5) [likely because they do it by snail mail, probably went out earlier]
Thursday:
PCOM (8/27)
Western (8/27)
Friday:
NYCOM (9/11)
So basically it seems like Mondays were the big day last year for interview invites followed by midweek. Tuesdays get the shaft

Of course this could correlate in absolutely no way with this year but I was bored and I wanted to do something other than study for my final.