time series model with special period of times

Hello wonderful people !
First of all, please excuse me for any English mistakes in the following text, I'm not a native ;)

I would like to model and predict the sells of a product in my company.
From times to times, during the year, the marketing department organizes special events and sells. For example : if you book a room between the first and 10th of September, then we offer you the breakfast.

Question is : what are the …

datascience series time time series