[hn0]

Try to understand their point of view. Maybe he/she hates your guts, but I doubt it.

I’d ask something like:

“I’m certain you have your reasons about not wanting me to attend the conference, but they aren’t clear to me. I have the best interests of the company in mind, but from my point of view this feels like a unduly limitation of my personal liberty. I do understand there’s not always the time or energy to explain yourself to those you manage, and I don’t want to question your decisions. But I wish you would explain your reasoning about why you feel I should not attend the conference. And maybe see if there is a possibility of a compromise? I hope you try to understand my point of view here, I do not want any sour feelings to develop between us.“

Also, give people time to change their minds. Just gently asking a few times a couple of times in advance, preferably during downtime or when your manager is in a relaxed state if mind. It might help them reconsider the idea, even if it feels like nagging. Just be wary that you don’t come off as “not listening” or questioning their authority. If you manager is really difficult you could ask a superior, but be very careful, you can be certain they won’t like you going behind their back.

[raducu]

Yes OP, and while you're at that and reducing your relationship with your manager to that of a parent to a 2 year old boy, also remember to kneel and kiss your manager's hand if they do you the favor of allowing you to do as you please in your own spare time.