Rotorua has its own team, RotoVegas, who missed out on making the A grade top four.
The top four sides in the semifinals today include Canterbury A, Canterbury Masters, North Harbour Black and Wellington North Gold.
The semfinals get under way at 9.45am with the final at 3.30pm.
RotoVegas manager Lee Browne said it was a big deal to have the event here in Rotorua.
She said the RotoVegas team were mainly made up of players from the Monday night netball league played at Rotorua Girls' High School. She said most of them had never played at the nationals before but were enjoying themselves.
"Quite a few of our ones are new to it. Only four of them have played at the nationals before."
New Zealand Men's and Mixed Netball Association events co-ordinator Kora Piwi Pene said about 300 players and management were at the tournament.
Pene said this was their biggest event to date.
"I think it's just the anniversary has brought a lot of people back. People who have been there through the years, and who have taken a back seat, are back on board again just to take part in this event."
He said it would be tough to get past the Canterbury A team today who are looking to keep their record going.
Two teams from Australia also competed this week. Rotorua has won the tournament twice in the past (1992 and 1993).