There is a lovely video of a French comedian setting up a fake col summit race, then looping in everyone out for a Sunday hill climb and seeing how they react. It's spoof, but it makes us consider whether we should propose a hill summit event as part of a cycling city, somebody wearing nothing but a pair of underpants to greet people cycling up park street. That's during the day -a half-naked runner isn't that odd on a Friday night, the main issue being will they have any lane discipline.
The council could also put together some kind of logo'ed banner at the top, to congratulate those city cyclists who top out
Something to make them feel grateful and welcome, and reinforce how the city values their contribution.
Alternatively, just put a taxi in the way.