Players involved: Wilbur, mostly. Maybe Dave might stick his face in.
Characters directly involved: Wilbur
Characters affected: Wilbur
When this would occur: It would start this next week, if possible, and run into the school year.
Plot in full detail: I'd like for Wilbur to steal a Time Turner from the Ministry over summer. He'll be visiting his dad's work before school starts which will give him the opportunity to steal a Time Turner. I've researched Time Turners in the HPverse and haven't come across anything that states whether the Time Turners are regulated or not. I just know you need to obtain one from the Ministry. I have no intentions for Wilbur to use the Time Turner for anything other than pointless things. Even then, I can't think of an instance where he would want to. He mainly only wants to steal one because he wants to show off to his friends at school. He has all the intentions to return the Time Turner, but knowing him, it wouldn't end up that way.

Ri and I have joked before about Dave and Wilbur accidentally using the Time Turner. I can only imagine the result would be their future selves hiding from their past selves, and people being confused because they just saw them five minutes ago.