Hi Dan,
Thanks for stopping by and having a look at our plugins! 🙂 We’ve designed all of our plugins, including Events Calendar PRO and Event Tickets Plus, from the ground up to be as flexible as possible for a wide variety of use cases. Depending on the setup you’re envisioning here, you should have no problems using either or both of these plugins to sell slots for short courses–tickets can be attached to any post, page, or custom post type (such as a calendar event) of your choosing, and Knowledgebase articles such as this one provide more information on how you can change the plugin text to remove references to “tickets”. I’d be glad to answer any specific questions you might have about how to make your desired setup work with our products! 🙂
I hope that helps to get you started here! Thanks again, and please don’t hesitate to follow up if you should have any other questions!