Azure Event Grid Availability in Azure US Gov regions
Updated: February 25, 2019
Azure Event Grid is now generally available in US Gov Texas, Arizona, and Virginia regions for production workloads. Not all event sources are available yet in US Gov regions. Services are being added continually, but currently only custom topics, Azure Resource Manager, storage, Event Hubs, Service Bus, and IoT Hub events are available.
Check out the Azure Government documentation to get started