Forecast Future One-time Events Based on Past Events: Future promotions and other one-time events can be best forecast from extensive data on similar events from the past. Holding records in a centralized database avoids the issue of the data leaving with the last sales representative. Extending the data format to include not just SKU, retailer, date and lift, but also relative degree of advertizing, duration, price reduction, if any number of locations, or other factors, makes the information infinitely more useful for the future.