Featuring entertainment and "great food" made by hospitality students, the dinner will seat homeless residents alongside corporate heavy hitters, such as Sky City chief executive Graeme Stephens and TPT Group Holdings managing director Mike Marr.
Merge Cafe manager Manu Kahlon said the event - like the cafe - aims to bring down barriers by creating a welcome space for everyone "regardless of their background or their social and economic status".
"Our goal is to merge," he said.
Lifewise last year placed 44 homeless people into rental homes as part of a pilot Housing First programme in partnership with other support groups, and chief executive Moira Lawler said Merge Cafe played a key role.
Housing First placed homeless directly into houses before dealing with any mental health or addiction issues, and Merge gives them a place to come eat and have a chat with friends.
"We know that once people are housed, they need a way to connect with community and contribute their talents," she said.
"Merge Cafe is a cornerstone to providing this support."
Those that come in to the cafe can access Lifewise workers for help finding housing, information about their Government benefits or navigating mental health and other support services.
They could also get budgeting advice and details of fun community activities they may want to take part in.
More simply, the cafe, which opened in 2010, gives homeless people a more dignified place to go, somewhere where "they won't be judged or made to feel different", Lawler said.
Tickets to next week's Merge & Dine event cost a minimum donation of $200.
Being Lifewise's main fundraiser this year, Lawler urged people to support the diner and also consider regularly dropping into Merge Cafe for coffee and a meal.
Merge Cafe is a place where everyone "can merge and make a difference for others", she said.
