Look at the crowds for this kind of thing.
Both of those videos are publicity stunts. Not that many people looking down from the bridges on the second video.
Not the kind of stuff that airshows are made out of.
If you try to provide that kind of "excitement" in a routine environment, something unpredictable will stop you.
A spectator throwing an object from a bridge.
A pedestrian leaking through a safety barrier and taking a short cut at the wrong time.
An untimely failure of some element of your aircraft at the most inopportune time.
A thermal that disturbs your flight path more than you anticipated.
Random variation in human performance.
A truck in the wrong place at the wrong instant.
A loose object in the cockpit.
Another aircraft interfering.
The possibilities of disruptive phenomena are virtually endless.
The object of an airshow performance should be to survive the experience,
every blooming time.