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, that product group can be added to an event or event template.
There are several ways to add products to a product group.
1. With the Actions menu in the Products submodule
Select one or multiple products in the list, click the Actions menu, and select Assign to product groups.
2. From a Product group's detailed view
In a Product group's detailed view, go to the Products tab. There, click on the blue plus button to start adding products.
3. With the Actions menu in the Product groups submodule
Select one or multiple products in the list, click the Actions menu, and select Assign products.