The line-up is an impressive list of who's who in New Zealand sport and broadcasting.
McBeth is a veteran broadcaster that has covered everything from rugby to Commonwealth and Olympic Games, bowling, athletics and yachting.
Stevenson, or Sumo as he is known, has become the face of New Zealand rugby punditry, and leads the line for Sky Sports in its rugby programming.
Mehrtens, regarded as one of the country's best rugby players, is still the All Blacks' second highest points scorer, sitting only behind Dan Carter.
The gala dinner is also an opportunity for charity CanTeen to raise funds and awareness.
A charity auction will take place, with funds raised used to support young people in the Bay of Plenty living with cancer.
CanTeen supports more than 1500 youth in the country, aged 13-24, living with a cancer diagnosis, or who have a family member with cancer.
the fine print
What: Tauranga Gala Dinner
Where: ASB Arena
When: September 29