At 13, I'd say that's reasonable for to do for now. In you later teens once your have experience going out on your own and navigating society and it's hazards, it would be overprotective. For now, you have time to gently and consistently push for bigger and bigger boundaries as time goes on. It's the best way to keep the number of blowout fights over it down. Personally I found that by not partying or doing other risky things behind my parents' back I never lost any ground in my boundaries. After you turn 18 your parents will sill have concerns and may desperately try to talk you out of things. Except in some very extreme circumstances they can't stop you (unless they take it to court), but they can use their money to provide economic pressures or incentives to do what they want, but you can walk away from that.
For now, enjoy the fair and maybe bring your mom a souvenir to show how well it went!
BTW, I'm 30 now, and I've found that occasionally approaching my parents for advice isn't always such a bad thing.
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"Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars."
- Unknown
"A fear of weapons is a sign of ret*d sexual and emotional maturity."
-Sigmund Freud