No. He's planning to forcefully disrupt by blocking the stage. Narcissistic to the core: "My views and need for attention are more important than the other 8000 people here who may want to see this talk."
I have participated in community events where venue security decided they had to forcibly remove protesters from the premises, and in one case they contacted police for help. I qualify those as peaceful protests, and I believe security / police took reasonable measures to respond. No one was hurt, and everyone got the message, whether they agreed with it or not.
When they try to move him, will that be use of force? When he tries to resist being moved will that not be forcibly staying?
A peaceful protest would be standing outside on the sidewalk with signs.
You invoke violence by disrupting somebody elses rights. You force people to use violence/force to remove you in order to maintain the right to free speech.