If someone is that eager to have an event outside work, then you should ask yourself why haven't they organized one themselves? Either it is option A (they are just brownnosing and saying what they think you want to hear) or B, 80% of people don't actually want to go out to events and it is really just a loud minority saying it and the others are just agreeing to sound good.

Chances are, you haven't actually asked 80% of your employees. Most likely you heard it second hand from a manager pushing this idea (again, brownnosing or looking for promotion) or you heard it in a group setting where people don't want to be seen as not "team players" and don't say there actual opinion on it.

If you change your policy, don't be shocked if a lot of people start leaving the company for some "unexplained" reason.