What is it like to walk out in an outdoor stadium for a combat sport in front of 80,000 people?

How would you feel if you were to perform or compete in a huge outdoor stadium in front of many people like this:

What is it like to walk out in an outdoor stadium for a combat sport in front of 80,000 people?
What is it like to walk out in an outdoor stadium for a combat sport in front of 80,000 people?
What is it like to walk out in an outdoor stadium for a combat sport in front of 80,000 people?
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