You can be waitlisted on October 15th also.
The class is not full at that point.
EDP is quite variable. They can take as long as October 15 to make a decision, though.
Many schools will give you a certain window within which you have to respond to their offer of admission (usually ~2 weeks). But you're allowed to hold onto multiple acceptances until April 30th - so "accepting" a school's offer of admission isn't binding or anything. After April 30th, you're only allowed to hold 1 acceptance - so you need to withdraw from any other schools you've been accepted to. You can stay on waitlists, though. In the event that you get accepted from a waitlist after April 30th, you just need to pick one school and withdraw from any others.
You can accept as many offers as you want before April 30, but that usually means paying a deposit of a few hundred dollars. After that, you can only hold one.
It really depends on the school. But in my experience, all the schools are doing is giving you an opportunity to withdraw if you know that you're no longer interested in attending that school. For example, I was accepted to a school back in November. I had to respond indicating that I either accepted or declined their offer of admission. But by accepting, I didn't commit to going to that school. I'm merely holding onto my spot. After April 30th, I have to either keep that spot and drop any other acceptances or withdraw from that school, if I've been accepted to another school that I'd rather attend.
Yes. Good point about deposits. But this also varies by school. The school I've been accepted to didn't require a deposit to hold my spot but some schools do.
I don't know the link off the top of my head but if you search for AAMC and "traffic rules" you'll find more info!
I think it varies by school.
As far as I know, you do get your deposits back for MD schools if you request them before April 30th
