More than the usual number of punters and performers were expected for the event, which would be launched at 5pm with a barbecue.
McGeorge said entry to the evening meal and show was by way of koha or "bring their own meat for the barbie", and the photograph would be shot at 7.30pm.
"It's encouraging for some of the families with kids who play music as well, so we can have future musicians in the photo too because we'll be creating a piece of history."
She said "the rockers can stay on" after the image is captured, and get down to the core business of the evening and make music together.
The imminent closure of the venue doors would be an event set to music, she said, although she believed other doors would soon enough open.
"There's a secret part of me that believes never say never, but as we currently see it we do have to close that chapter and set ourselves up for the next part of the musical journey in Wairarapa."