How would you create an automated module that can find impact of festivals on sales

I’m in a situation where I need to create a module/function that can take in a date, and a timeseries and find out when the uplift due to a festival kicks in (n? days before the festival), then measure the uplift in sales until the festival date/when the uplift ends. It should also be able to measure how long there’s a dip in sales post the festival. And also, very importantly if there’s an uplift and/or dip.

My current idea …

automated datascience festivals function impact sales timeseries