The phrase "a demonstration about" is correct and usable in written English.
It can be used when referring to a presentation or display that explains or showcases a particular topic or subject matter.
Example: "The professor organized a demonstration about the effects of climate change on local ecosystems."
Alternatives: "a presentation on" or "a showcase regarding".
On Saturday and Sunday at 1 p.m., there will be a demonstration about fertilizers for rose gardens.
One day I just came by a science museum and enjoyed a demonstration about Delayed Auditory Feedback (D.A.F). at a cognitive science corner.
That's public land and whenever there is a demonstration about anything on Canary Wharf it is on that piece of land – they are directed to a little plot".
Furious locals held a demonstration about the incident on Tuesday, prompting police to send in a tank and hundreds of officers.
Mr Griffin originally took to Twitter to ask for the address of the 'two bullying "gay" activists' so he could arrange a demonstration about homeowners being able to 'rent rooms to whomsoever they wish'.
Five protesters arrested in Wakefield while holding a demonstration about pensions during a visit by the Queen won damages after the police were found to have breached the right to free expression and peaceful protest.
Moments after the disruption, a Tibetan woman doused herself in red paint and lay in the road in front of a torch runner while police officers arrested two other Tibetan protesters planning a peaceful demonstration about a mile from the old sanctuary.
Images of protesters bloodied by police quickly spread. 1 December A demonstration attracts about 300,000 people, the largest in Kiev since the Orange Revolution in 2004.
But just as a demonstration was about to get under way to create a smoky, realistic-looking liftoff on a small video screen, power to the model went kaput.
On Oct. 1, 1979 — National Day — Mr. Wang led a demonstration of about 1,000 protesters that ended up with a speakers' platform on the steps of the Beijing municipal party committee building.
A demonstration of about 3,000 people -- that Mr. Arafat had pledged to American security officials would be restrained -- had reached the perimeters of Mr. Arafat's building as General Powell was whisked away in a heavily armored van.
