Ratings! user ratings after meet ups
Allow users to post ratings or reviews for other users to see on profile after meet ups. User A could post user Bs review of them on their profile for others to see and read. Ex: “Met A for a walk while I was in town visiting. Hope to see A again if I’m back.” A could request B to review their meet up, review the feedback and choose to post B’s review for others to see.

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Mark commented
Yeah I agree, but not anonymously - reviews only to able to be submitted or exchanged when agreed to.
I come to your house, then request the ability to submit a review about you. You would have to agree to send me a link to submit a review about you, but if you do send me that link my profile automatically sends you a link to submit a review about me.