How about the MCG? Can we get more in like 25,000 people.
Concerns about how that many people will get to the 'G. Trains and trams too packed for safe social distancing, queues at turnstiles, too many people to temperature check before entry, etc.
They could just close off the top tier(s) and reduce the capacity of the 'G to <40k. That way 10k could still turn up and sit spread out right around the ground level seats.