Mrs Pope - their grand-daughter and Star and Garter co-owner - previously did not know they had their wedding reception in 1940 at the Oamaru restaurant.
Then she found out her other grandparents, John and Pat Oats, also had their reception there, as well as her great-grandmother and her great-uncle.
So Mrs Pope put her grandparents' wedding photographs on the wall and it snowballed from there, with people bringing in or sending wedding photographs - some from as far afield as England.
"It's just incredible, it started getting bigger and bigger. The history is fabulous," she said.
There are now about 80 photographs on the wall showing couples who held their wedding receptions at the Star and Garter, along with some invitations.
The most recent was Jeremy and Carolyn Craik, who married on February 28 this year and the oldest dated back to 1925.
The Star and Garter is one of the three oldest restaurants in New Zealand.
Mrs Pope planned to also copy the photographs and put them in a book, so people could look at them while they dined.
She has been approached by the Geographical Society in England wanting to know how it started.
Oamaru Red Cross celebrated its 70th anniversary with a function at the Star and Garter last week and, from that, Mrs Pope got four more photographs.
