I for one am up for this, a non commercial back to basics run sounds great.
Hopefully there’s a lawyer on here, who can advise how to do it legally without attracting unwanted attention.
Maybe we all have to hold placards, making it a legal peaceful protest for [insert comedy subject], to workaround the fact the event would be uninsured and not ticketed etc
Let's have "LGBT posters", and call it the London, Gatwick, Brighton Trial.
The authorities wouldn't dare to object.