> ## Documentation Index > Fetch the complete documentation index at: https://docs.simcel.io/llms.txt > Use this file to discover all available pages before exploring further. # Set Base Demand > Manage and assign demand events to adjust base demand with past or future impacts. ## Demand events Under the **IBP** section on the left-hand side panel, click **Event Management**. SIMCEL left sidebar with the Event Management option highlighted under the IBP section On the Event Management page you can see the list of events. Click **New** to create a new event. Event Management page listing existing events, with the New button highlighted You can choose between multiple types of events: * **Demand Adjustment** - Increase or decrease demand due to internal or external events. * **New Demand Stream** - Manually create future demand for new products. * **Forecast Override** - Manually override the initial future demand forecasted by SIMCEL. * **Pricing Adjustment** - Manually set or adjust the price of your products. * **Trade Terms** - Model trade expenses and calculate the net sales value. New event dialog showing the event type options: Demand Adjustment, New Demand Stream, Forecast Override, Pricing Adjustment, and Trade Terms ## Create and assign an unplanned event Imagine demand decreased by 40% in May 2023. Create an event to capture it. Name the new event **May 2023 drop**. Select **Demand Adjustment**. Name the version **V1**. Select the period from **Jan 2023** to **May 2023**. In the **Delta Adjustment** section, set the value to **-40%**. Write a description of the event. This is optional. Click **Save**. Demand Adjustment event form with the event name, version, period from January to May 2023, and a -40% delta adjustment There are two methods for adjusting values: * **By percentage** - For example, a demand decrease of 40%. * **By absolute value** - For example, a decrease of 50,000 units. Switch between these options in the unit selection. ## Assign the event to actual Go back to the **Demand Planning** page by choosing **Demand** in the left side panel. SIMCEL left sidebar with the Demand option selected, returning to the Demand Planning page To assign the event to **Actual** and adjust the **Base Demand**, click the menu button next to **Actual** and click **Edit**. Demand Planning page with the Actual dataset menu open and the Edit option highlighted Select the newly created event **May 2023 drop**, then click **Save**. Edit Actual dialog with the May 2023 drop event selected from the list of available events You have assigned an unplanned event to the Actual plan, and you can already see the change on the Base Demand. Demand chart showing the Base Demand line adjusted after the May 2023 drop event is applied to Actual ## Adjust base demand with realized performance Go back to the Event Management page, expand **May 2023 drop**, and click **Duplicate**. Event Management page with the May 2023 drop event expanded and the Duplicate action highlighted Edit the version name to **\[user initials]-realized**, set the demand impact to decrease by 20% only, and click **Save**. Duplicated Demand Adjustment event with a renamed version and the delta adjustment changed to -20% Event Management showing the original event and the new realized version saved alongside it Assign the newly duplicated event to **Actual** and click **Save**. You have adjusted your Base Demand with the actual performance of a planned trade and marketing event.