EAD expiring sept 03. Biometrics on aug 28

[gratnakar]

Hello friends-
I am at critical point now.

I have couple of questions need answer at the earliest:

1. My EAD is expiring on sep 03. But, I got biometrics appt for aug 28. Is it possible to reschedule to before date so that I can do it sooner? Or I can just walkin before the actual date for the biometrics appt? Is that possible? What are the supporting docs for appt?

2. My Indian passport is expiring on oct 12-2012. How much time before I needed to renew and/or how much time it is ok to wait for renew even though passport is expired?

Please do your dear help,

Thanks
Gratnakar