About 80 family members attended the reunion, which started on Saturday morning with a tour of Hart's Black Horse Brewery at Wetherstons.
The group shared a barbecue lunch and beer tastings, followed by a dinner at the Lawrence Golf Club that night.
Organiser Bernadette De Bono said it was a "rewarding experience" and she enjoyed the chance to get to know other family members better.
"He [Benjamin Hart] left a legacy that if you take a small amount of time, you can make a huge amount of effort."
Fellow organiser Cindy Hart said one "missing" family branch was unearthed just three weeks before the reunion.
"I was on the way home [from Queenstown], rain was bucketing down and I turned up at the [Lawrence] brewery, rang the number and before you knew it, I was hearing about the Hart family reunion," he said.
His grandfather Edward, son of Benjamin, had moved north, eventually settling in Auckland and lost touch.
The family attended Mass at St Patrick's Catholic Church in Lawrence on Sunday, followed by a remembrance and wreath-laying service at the cemetery, ending the celebrations with a morning tea at Wetherstons.
• In 1862, Benjamin Hart journeyed from the goldfields of Bendigo, Australia, to the goldfields of Otago. He arrived at Wetherstons, near Lawrence, and settled there. His wife, Mary, arrived in 1863 with their three children. The couple had another eight children. He mined for many years before becoming a carter, leasing the Black Horse brewery in 1884 with J.K. Simpson.
Benjamin Hart was the director of several dredging companies and has been credited with instigating Daffodil Day in 1900.
Daffodils still grow at the site of the Wetherstons brewery and are donated to charities.
