<human>:  Could Maroon 5 have hypothetically held a concert at Roman Colosseum?
<bot>: Yes, Maroon 5 could hypothetically have held a concert at Roman Colosseum. The Roman Colosseum had a capacity of 87,000 people. Maroon 5 has held concerts at Brazil's Allianz Parque, which has a capacity of close to 44,000. Almost 30,000 people attended Maroon 5's 2015 Madison Square Garden concert over two days, not one day.