How can I convince my mom to let me go to HHN?

So I'm 14, and right now FNAF is the most important media to me, and has been for a couple years. In short, if I don't go this year, I will regret it for the rest of my life. My mother thinks that I'm crazy for wanting to go. She literally thinks I'll die of a heart attack. I know she wants to protect me but I really think it's doing me more harm than good. Ideas?