When to send it
Post the link in the community's WhatsApp group the evening after the meetup, with a short message thanking people for coming. Keep it informal: the people in the group know you, and a friendly line works better than a formal request. In a busy group, pin the message for a day or two so later readers still see it.
Why these questions
A community depends on people wanting to come back, so these questions look ahead to the next meetup as much as back at the last one.
The first is a simple star rating for the meetup. The second asks which part people got the most from: the talk or main session, small-group discussion, meeting new people, or something else. Organisers often pour their effort into the talk while members mainly value the conversation, and this question shows whether that holds for your group.
Then an open question about what would make the next one better, followed by a checklist of the times that suit people best. Settling on a regular slot that works for most of the group is one of the simplest ways to grow attendance, and it spares everyone the long "what day works" thread.
The last question asks whether they'd like to help: speak, host, or organise. Anyone who says yes sees an optional contact question, with a note that it's only so you can get in touch about helping. Groups that rely on a single organiser tend to fade when that person gets busy, so finding helpers early matters.
Why there's no coupon
Most community meetups are free, and members come for the people rather than a purchase. A coupon would feel out of place among peers and could make the meetup look like a sales event. The thanks that counts here is visible change: a better time slot, a format people asked for, or a member invited to host.
What to do with the answers
Share a short summary back in the group within a week: the time slot most people chose, the part they valued most, and what you'll try next. Then message everyone who offered to help, personally and soon, while they're still keen.
For larger ticketed events, event attendee feedback is a better fit; for online sessions there's webinar feedback; and for hands-on sessions run by the community, try workshop feedback.