Use a tirfor or similar style winch then put a lock stop behind the winch and hang the banner over it to hide it . One of you will have one in the garage somewhere 
Can’t be rocket science, the ancient Greeks and Romans managed it.
Just a logistics problem of finding those Nubian slaves in South East London.
When/where is this village fete? Can we all come down and have a look?
Jetstream I’ll let you know next summer once the date is fixed, but be warned, it can be a fete worse than death.