Earlier quoted context omitted.
> OP feels going to the conference is a must, "a given", a "constitutional right", and that the manager "wronged" him by not letting him go. It's a very childish way of viewing the world. OP's employer does not own them - they have a right to a private life. While they certainly could not want OP identifying themselves as an agent of their employer when giving a talk, OP is entitled to use their free time / vacation…
That's true as long as they're not talking about their work at the conference. I assume they would be?
She wanted to do an external presentation on cutting edge security testing (nothing proprietary, just cutting edge) and the idiot manager wouldn't let her.
She asked why and was given bullshit reasons and so she asked her manager's manager which esentially let her do the presentation and agreed with her she was given bullshit reasons.
Nevertheless her direct manager kept a grudge and she eventually had to leave the company, I'm sure she went to a much better place after that.