Ben Franklin effect
The Ben Franklin effect is the finding that people like you more after doing you a small favour, because they infer their feelings from their own behaviour.
How it works
The expected direction, do someone a kindness and they warm to you, holds. The less obvious half is that the reverse holds too: having helped you, a person concludes they must have wanted to. The conditions are strict. The request has to be genuinely small, genuinely optional, and gratefully received; a demand dressed as a request runs the effect backwards. Asking a guest to shift a booking by half an hour qualifies. Moving them to eleven at night does not.
What it changes for a personal brand
Ask your audience for something small and skippable: which of two things they want next, a question you will answer publicly. Handled well, the person who does you that favour is more invested afterwards, not less. Handled as an obligation, it costs you the relationship you were trying to build.