There are two possibilities:
By copying and pasting the direct booking link
Go to the calendar > Click on the session in question > Click on "copy the direct link to a booking page".
You can paste this link into your communications later.
By integrating a widget on your website with only the workshop in question
Go to the "Settings" tab > Click on "Widgets" > Select "Workshops" as component > Filter the activity by selecting the workshop in question.
Finally, copy and paste the link for this configuration on your website.