At a restaurant last night in Washington, D.C.—for a SIPA Chapter meetup which I hope you can make it to sometime—the waitress was serious about getting us to fill out a customer survey. She brought out extra portions for us to take home. She circled the url on the check and wrote her name. She promised a coupon if we filled it out there, then just gave us the coupons, asking if we could fill it out before midnight. (Maybe her car would turn into a pumpkin if we did not do this.)
"At all times remember the goal of the invite: to persuade the respondent to provide their feedback on your organization. That's it. Nothing more. Don't add words into the invite that do not directly help you achieve that goal."