I don't know when Orientation is for this coming year, but I cant tell you that last year we had orientation the second to last week in August. We started school the last week of August. (The Monday before Labor Day). Orientation was for three days ( I think, I don't really remeber) and mandatory (that I remembrer). Also, sometime in June we had a welcome day/meet each other day. Also school for year 1 ends July 6 or so.
During orientation, we got our instruments, lockers, and heard a lot of speeches. I think there were other stuff also, but I honestly don't remember. No classes, except we may have had an inroduction to anatomy.
Hope this helps