Hey @katb — welcome to the seller community! 🙌

Depending on how you've set up your workshops in your Item Library, I would suggest that you use the basic inventory management option.

This would allow you to put in the workshop capacity in the "In Stock" section and set an alert. For example, if you set an alert with a three-spot-left threshold, you'll receive a notification in the online dashboard and via email. In addition, if you're selling the workshops using the Online Store and using inventory tracking — once the last workshop is purchased, it will not be available online.

Hope this helps get you in the right direction. If anything else comes up or if I'm missing the mark, let us know. 🙂