This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
Cart is a small but powerful extension which “solely” adds a shopping cart to your TYPO3 installation. Cart Events provides an own data storage for events. Events can be offered via a list and detail view and can be purchased via cart function of the Cart extension.