By not making the follow-up call, you put yourself at risk when attending other events.

What happens if you bump into that person again when you are out attending other events?
How are you going to feel when you spot them and remember what you haven’t done?
Are you going to try to pretend you haven’t seen them and try to avoid them all night?
Are you going to pretend you’ve forgotten that you were meant to do something?

…and what are they going to think when they see you?

Long after people have forgotten what you said to them, they never forget how you made them feel

Your credibility will be lost.

That’s bad for business!