In order for your products to be visible in an event or event template, they first need to be part of a product group. Later, this product group can be added to an event or event template.
There are several ways to add product groups to an event or event template.
1. With the Actions menu in the Product group submodule
Select one or multiple product groups in the list, click the Actions menu, and select Assign events / event templates.
2. Inside a Product group's detailed view
In a Product group detailed view, click on the Events / Event templates tab. There, click the + button and add your product group. In the popup, first select whether you want to add your product group to an event or an event template and click Save. You can search for your events or event templates in the following popup window and add your product group to them by selecting them and clicking Save. You can assign as many events or event templates at once as you would like.