A Youtuber that gets different groups of experts to compete in who can most impactfully improve random people's lives.
Dentistry example: A Youtuber and a few dentists get together to create a series where they pick random people off the street and make their teeth perfect for free. A win-win situation where the show gets views, the dentists get publicity, and a few people get perfect teeth.
After the dentist series, they could replicate the same concept for other fields/expertise. Go around to enlist various experts and see how they can improve people's lives.
It gives the experts a sense of fulfillment to do good for others by doing what they are good at.
Improve some people's lives.
Show the viewers what a difference a specific expertise can make on peoples (potentially their) lives.
Almost free publicity for each of the experts involved. This brings more future customers.
5 minutes of fame for the participants. In the upcoming weeks, everyone who they bump into and has seen the show will ask/comment on their results.
A videographer and a group of dentists get together. They go out on the streets and have a local standup comedian put on a show that makes random passersby laugh. This gives them the opportunity to look at people's teeth.
They are looking for people who have such bad teeth that a drastic difference would be apparent between the before and after shots.
They approach (on video) and try to enlist such people for the free teeth makeover. They enlist as many participants as there are dentists.
The dentist/participant pairs are randomized by having the participants pull the dentist's name out of a hat. On the piece of paper is the dentist's name alongside the name of their practice (brand/advertisment).
In the following weeks everyone does their magic. The dentists fix their patient's teeth by straightening, replacing, polishing, and whitening them. A video crew follows along and documents the process.
The before and after video should be made under identical lighting conditions and each person should wear the exact same clothes, hairstyle, etc.
The viewers vote on which transformation was the best. The winner gets nothing. Everyone already won:)
An alternative competition could be to try and create the most natural/realistic looking artificial teeth where polled passerbys can't identify them as being artificial.
Follow up with participants a few weeks after they've had their teeth fixed. Ask them to tell the viewers how having perfect teeth has affected their lives.
A 4-part video series is produced and published on Youtube:
Part one: dentists get together and look for participants.
Part two: the makeover.
Part three: the results.
A mini-documentary combining all of the above.
How to publicize the project
This could be done by a Youtuber who is already popular within a country/city. The dentists, the participants, and the viewers would be local.
While the above idea uses dentistry as an example, the same concept goes for other fields of expertise.