"One week after the application deadline, we will begin the first of several waves of interview invitations. Don’t sweat it if you aren’t among those who receive an early invitation. We need to start somewhere with the process, and literally conduct interviews up through a few days prior to the decision notification date. Keep checking your email!"
"INTERVIEW INVITATION
Within one week of the application deadline, we begin to invite applicants to interview. The initial invitations are sent to a group of candidates based on an initial review of application information.
We typically begin the interview cycle by holding interviews on Monday, Tuesday and Thursday with a combination of on-campus appointments and Skype slots. For those coming to campus, the interview appointments are created to allow for a Campus Visit as well.
Quite literally, if you are not invited to interview initially, you may receive an invitation any time prior to the decision notification date. The Admissions Committee (AdCom) puts no value on the timing of when you were invited to interview – it doesn’t matter if you were the first person to interview or the last person to receive an invitation. At the end of the day, AdCom is interested in knowing how well the interview went."
- Admissions Blog
I hope this will shed some light on all the questions about the interview invites