Disable watering on specific days

I am trying to work with API or webhooks for a specifc task.

I live on a lake that gets treated chemically for weeds. When this happens we can’t water our lawns for specific days. I am trying to set up an application which queries a web page to determine the days to skip, and then automatically removes the days from the schedule on the Rachio controllers.

I see in the API how to get the device id, schedules, etc. But for some reason I haven’t found how to target specific dates and date ranges. Is there a way to easily do this? It seems like i could use the weather delay, but I don’t want to do it for every day UNTIL a dates, just on a specific date window.