Hi David, thanks for your response.
I thought about using the LMS to trigger an announcement or message to trigger the survey, but it's not really doable (no inbuilt functionality). The trigger would be either when the classroom course offering is closed (which is done in the LMS), or when the student completes the classroom course test (which is done online, in Storyline). Prerequisites for attending the classroom course is a laptop, and having done all of the course prerequisites in the LMS, so there is no question that the student will have a computer with a working email client.
Having the survey done immediately after the test is, of course, a possibility. However, the reality is that the test is the last thing that is done before everyone packs up their belongings to go back home. Most people are more interested in getting out of the room than anything else, let alone a survey... It would also be good to give them a rest so they can reflect a little on the experience of the week-long course, before asking for their feedback. At least that's my opinion...