Help Me Find This Book 2

Hahaha sorry it's me again I just really want to find these books because they're so interesting and I want to read them again. I can barely remember anything so I'm very impressed if you can find my book with just these small details

Genre of the Book:
Horror and Mystery

Descriptions:

I only remember that a group of kids are in this camping kind of activity with I assume, it is a class field trip (this may be false). I remember this abandoned circus and how the other kids were saying to not go there becasue a mad man resides there.

Again you an ask questions down below to clarify things if you think you've found my book. Thanks for your help!