You can use a tag filter to present specific events or classes to your customers, such as Children's and Adult classes. The single tag filter is useful as the tag name and iframe code can be reused multiple times even if the entry is deleted, as you can add the same tag name to your new entry. 

To filter the iframe by a tag, you will need to modify the iframe code to include the link to the Bookwhen public page that contains the tag name. Learn more information about creating a tag, and how to integrate the tag into the link. 

Below is an example of how the final result will appear after applying the filter: