Pick three or four, not all of them. Include one from the second group and ask it at the start as well as later, because that pair is what gives you evidence rather than an impression.

How did this session go
Ask in the room, at the end.
What's changed for you
Ask at the start and again later, in the same words.
Would you come back, would you recommend it
The plainest test of whether it is working.
What we should do differently
Only ask if you are prepared to act on the answers.
Our own questions
Tell people why you are asking, what happens to the answer, and that they can decline. Take particular care before a person’s own words leave internal use: a quote can identify someone even with the name removed.
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