I interviewed on one of those dates (31-2) and I'm in touch with enough of my potential classmates to be certain that relatively few, if any, invitations went out. No one I know personally has heard anything. Easter Sunday is tomorrow so I wouldn't be surprised if this is an unofficial 4-day weekend for some contingent of HR. Perhaps ContactApproach's internal recommendation knows a guy. Congrats Contact, either on the class date or on a successful troll.