I don't wanna sound like an old man here but lying to him will get you f-ed in the end. That phone call from the track one night cause you shelled something needing him to help you get the car back home will be the worse. There is always the option of not telling him and just going but, before you go that route let me throw something out there. May work, may not. Sit down with him like a man, tell him confidently and adult like, that you would like for both of you to go one nite/day. Tell him you just want him to see what it is that you are very interested in. Most parents would rather see there kids do what makes them happy (if its legal mind you) then nag them completly to death and have them go behind their backs and do god knows what. Just make him see that this is something you love and you arent out on the streets pounding it out and you arent out doing drugs and **** (I hope,LOL). My mom and dad where the same way with my bullriding. They didn't want me doing it and they definatly didn't wanna go. I sat them both down (even though they where divorced) and told them. This is what I am into, I know you where into stuff when you where young and I want you to go with me and see how much fun I have and I want your support. I didn't beg or plead with them I just made them see I was adult enough (even though I probably wasn't back then lol) to do stuff I loved and I was smart enough not to get hurt. Try that first. Good luck with it man.