Supercars resumed racing at the end of June after putting its 2020 season on hold in March due to COVID-19.

It's return round was held at Sydney Motorsport Park (SMP) with restrictions on crew and broadcast team numbers, and spectators not allowed to attend.

The revised calendar, which is subject to change, will see Supercars return to SMP again this month before taking the championship to Darwin in early August, where spectators will be allowed for the first time.

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The move makes it look more likely that there will be a crowd at the Bathurst 1000, but Cr Aubin said the size is up in the air.

"It's one of those interesting things that we have been mulling over for the last little while now, what sort of crowd are we actually going to be allowed to have there," he said.

"At least now it sounds like we'll be able to have a crowd, but how many I don't know, and I very much doubt whether it'll be opened up to Victorians to come."

Victoria has seen a spike in new daily COVID-19 cases over the last fortnight, with up to 127 identified in a 24-hour period, resulting in lockdown measures being reintroduced.

The situation will see the border between NSW and Victoria close at 11.59pm on Tuesday as a precautionary measure to contain the virus.

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Cr Aubin said he is concerned the outbreaks in Victoria could threaten the Bathurst 1000 and other sporting events over the coming months if they're not able to be controlled.

If spectators can attend in October, he suspects there will be a cap on how many can come and that people won't be able to buy tickets at the event, as has been the case any other time.

He is unsure when the confirmation on crowds will come, but hopes a decision will be made at least six weeks before the event, as that's when council starts the preparations.