I have been contacted for a UPenn in a rather interesting way. I was contacted today with a specific time slot of 3 hours tomorrow and asked if I would be able to attend it. Also, I thought all reports were sent back by now so does this late interview means anything?
Reports are due March 1st. That is why the interviewer wants to have it tomorrow. Given the huge number of applications this year it has been very hectic for alumni interviewers, and that is why he/she probably reached out to you late in the process.
They’re in the stage of the process where they’re trying to recruit more volunteers to fit in as many last minute interviews as possible, so nobody is in the leisurely “let me know any time this month you’re free” phase anymore. If you can’t make any of those times, just let them know.