Jim Beam Homegrown will pause this weekend while respects are paid to those affected by the Christchurch shooting.
Organisers say musicians will take to all of the stages at 9.25pm to share tributes, and a minute of silence will be observed.
Additional security measures have also been implemented at the event, and organisers say wait times for gaining entry will be increased as a result.
The event is expected to be attended by about 20,000 people, and the singers leading tributes include Dave Dobbyn and Stan Walker.
Homegrown Events Chief Executive Andrew Tuck said arranging some kind of reocognition for the attack during the festival was the right thing to do.
"One of the best things about great music is that it's blind to things like race, culture and religion and brings people from all walks of life together to stand shoulder to shoulder," Mr Tuck said.
"All of the Homegrown whānau, including all the performers, wanted to show respect to those caught up in the tragedy and give the audience the opportunity to come together as well."
A pre-party event will take place tomorrow night on Wellington's waterfront, with the main event taking place tomorrow.