When I went to the PSW, I was told that international students aren't invited. I don't think it's a personal thing, I think it's financial. To compare, Columbia invites international students but they have a reimbursive model, so you'd buy your ticket and then Columbia would pay you back up to $500 (which wouldn't pay for most international flights). NYU, on the other hand, pays for your ticket out-right, so you don't have to go in debt. That just means only domestic flights are eligible.