Join an 'ICE watch shift'
Neighbors organize and keep a physical lookout.

An explainer by Nikki Marín Baena, co-executive director of Siembra NC, published two days ago in Teen Vogue. Marín Baena wrote:
In 2017, following a previous set of Trump executive orders, immigrant families in North Carolina were inundated by misinformation and rumors about ICE agents hidden in grocery store parking lots and supposed substations near after-school facilities, leading some people to avoid leaving home. There was no Spanish-language rumor verification hotline here in Greensboro, so our organization — which was just a handful of volunteers at the time — created one, giving more people the ability to talk to a live human and ask whether an undated Facebook post they'd seen shared by someone else was real. We also trained hundreds of volunteers with driver’s licenses to participate in an ICE Watch neighborhood watch program, giving immigrant parents a way to verify the rumors people forwarded them in WhatsApp.
They also "started an emergency cash-assistance fund to provide small grants, usually between $300 and $2,000, to help the family stave off eviction and afford the first payment to an immigration attorney."
Siembra has a playbook: Defend & Recruit. From that page, you can also sign up for a training.
Ivan Almonte created Respuesta Rápida de Durham (Durham Rapid Response), a support line for people in Durham worried about deportation. In Raleigh, Comité Acción Popular runs a support line called RadarSafe. (As mentioned in WHQR Public Media.)
Here's a Cop & ICE Watch Training (PDF) used by the Jackson Heights Immigrant Solidarity Network (passed along today by J. P. Hill).