At a bare minimum, if you get questioned about a neighbor or coworker, "I don't know" and "I can't recall" are your go-to's, no matter how benign the question may seem.

A couple things:

• ICE operates under rules that say they're not supposed to detain people at church. So encourage people to spend raid day at church.
• Don't help out. Give the absolute minimum, don't provide information, and refuse to give access on the basis of an administrative warrant (one not signed by a judge)

Edit: since I posted this, the rules ICE operates under have been changed to allow raids at churches.

Smash up the busses used to transport them