I have seen one or two indicators that display scheduled economic calendar events that may affect the market. But the ones I have seen don't work historically, which I want so I can test. I'm working in Ninjatrader on ES/MES and want to be able to access these events in advance from an automated strategy. Specifically, I want my strategy to stop trading during them. Does anyone know of such an indicator that will work even during ninjatrader playback? If one doesn't already exist, does anyone know of a service that has an API that I could use to write my own such indicator? Thank you.