Saturday's history breaking night Grand Final between Richmond and Geelong will be played in front of 30,000 fans at the Gabba.

The AFL had planned to host closer to the venue's 38,000 capacity, with league CEO Gillon McLachlan confirming the limit comes under the Queensland Government's advice.

As we've done all year, we respected the advice and decision of the Chief Health Officer and the government," McLachlan said.

"The atmosphere at the Gabba on Saturday night was electric, it felt full.

"It'll be an unbelievable Grand Final atmosphere and we're very pleased to be here."

The 2020 Grand Final will begin at 7:30 AEDT as the first ever AFL night Grand Final.