What should be done about conflicting invitations for graduate school interviews?

[Windeolus]

I have received emails from two schools, one with an admission offer (no funding info yet) and another to visit. Both have the same interview weekend. I accepted the first one when the invitation arrived, and now the second has arrived. Both are top choices in my book, so it's hard to drop one.

What can be done about conflicting interview dates for Aero graduate school?

[PsyDuck90]

Schools sometimes have alternate dates. I would suggest informing the 2nd program that you already have a conflict that weekend and would love to interview, but you already have a prior commitment and if the interview can be on a different date.