The Daimzel Rongokea-led Arorangi made it through to the premier semis after defeating Takuvaine 65-49 last Saturday.
The team comprise young players who have proven to be giantkillers against top teams in the competition.
Avatiu will have the services of some of their experienced players and is expected to be led by former Cook Islands skipper Luciana Nicholas.
In the other semis, the undefeated Titikaveka will play Tupapa for a place in the final.
Titikaveka will head into the clash as the favourites and the onus will be on Tupapa to stage a major upset.
In the reserves division, Avatiu will take on Titikaveka and Arorangi plays Tupapa.
This knockout stage will also see the matches in the six and under to 15U divisions battling for a place in the final.
Netball Cook Islands general secretary Ngere Puia-Fraser earlier said the knockout competition required a winner, adding there was a procedure for extra time to determine the outcome of the match, if it ended in a draw.
“There shall be a two-minute interval at the end of full time. Extra time shall consist of two halves of seven minutes each, with an interval of one minute at half time,” Puia-Fraser said.
“Teams shall change ends at half time. The centre pass is taken by the team entitled to the next centre pass. During both of these intervals, substitutions and/or team changes may be made.
“In the event of a tie remaining at the end of extra time, a visual signal shall be used to indicate that play shall continue until one team has a two-goal advantage.”
For age group teams, 2 x 5 minute halves of extra time will be played while the senior teams will play 2 x 7 minute halves.
Court 1 - 11am 6 & Under Takuvaine-Tupapa, 11.20am 8U Tupapa-Takuvaine, 11.50am 10U Titikaveka-Arorangi, 12.25pm 12U Avatiu-Tupapa, 1.10pm 15U Takuvaine-Tupapa, 2pm 17U Tupapa-Avatiu, 3pm Reserves Avatiu-Titikaveka, 4pm Premier Avatiu-Arorangi.
Court 2 – 11am 6 & Under Avatiu-Arorangi, 11.20am 8U Arorangi-Ngatangiia, 11.50am 10U Tupapa-Ngatangiia, 12.25pm12U Titikaveka-Ngatangiia, 1.10pm 15U Avatiu-Arorangi, 2pm Reserves Arorangi-Tupapa, 3pm Premier Titikaveka-Tupapa