Large group meetings and workshops are expensive and, thus, important to get right (or at least as right as possible). A simple technique I’ve found useful to keep honing those large group meeting/workshop skills: carve out 5-10 minutes at the end to ask for feedback.
Sending a survey can work for massive events as we’ll likely end up with a large enough sample. But, for most of us, organizing a massive event isn’t the norm.
So, in these 5 minutes, we can choose to either request folks to fill up a simple survey or just ask folks for 1 thing that went well and 1 thing they’d improve. I’ve seen both work really well.
Regardless, the main thing isn’t so much the technique of asking the question (this can be tweaked) – instead, it is to simply prioritize it enough to ensure it is on the agenda.