Pre-wedding jitters have intensified and corporations have forgone scheduled events on the back of new social distancing rules announced on Wednesday.

Prime Minister Scott Morrison banned indoor gatherings of more than 100 people, except for at schools, universities, airports, public transport, medical and emergency services facilities, aged care homes, jails, courts, parliaments, supermarkets and many workplaces.

Villa D'Oro owner Claude Guido said cancellations were coming in thick and fast with a bride putting off her May wedding at the Wollongong function centre this week.

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"I have had cancellations from corporate clients," he said. "I have lost conferences and fundraising events. On Monday I spoke to three brides who were very nervous.

"They are worried the government is going to change its policy and keep reducing the number of people allowed at social gatherings.

"The brides are also concerned because they have guests or bridesmaids coming from overseas."

Centro CBD function centre co-owners Robert Specogna and Michael Arbelias are also trying to navigate the evolving and "uncharted territory" as large functions such as lunches, christenings, and birthday parties of more than 100 people were cancelled at their venue.

"We also have education, sporting and medical organisations cancel functions planned at Centro CBD," Mr Specogna said.

Mr Guido was trying to reassure anxious brides, telling them he would try to accommodate changes for events while also considering his staff, family and business.

"It is very concerning how I will keep the doors open," he said. "I have a large venue and huge overheads.

"We are different to cafes and restaurants who have people trickle in despite having lower numbers. But if someone cancels an event, we can't get another one in."

Mr Specogna said he was worried cancellations would continue throughout coming weeks and months however understood why the government had made the new social gathering ban.

"We have to protect people, and we understand the ban is what needs to be done," he said.

"If we go forward without changes then Australia could end up in a situation like Italy where so many people are diagnosed with the virus.

"This is the best way to get through this is to try and stop the spread early."

He said it would be a tough next six months.

"These conditions can put a lot of businesses out of operation," Mr Specogna said. "We are still calculating our figures if the bans continue for six months and are thinking about our options."

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Mr Specogna hoped the federal government's initial $17.6 billion economic small business stimulus package would help cover costs.

Tumbling Waters Retreat - where six people confirmed to have COVID-19 attended a wedding on March 6 - owner Sonja Keller said a wedding on Sunday had to be cancelled because the bride and groom were stuck in China.

"We will have to work harder when life gets back to normal," she said. "If people do want to cancel or change their function then we will try to keep everyone happy."

The wedding guests were not contagious when they attended the venue so Ms Keller hopes her businesses' reputation is not damaged.