Which of the following actions does NOT involve a charge of trespassing?

Camping on private property with consent does not involve a charge of trespassing because consent is a crucial factor in determining whether trespassing has occurred. Trespassing typically involves entering or remaining on someone else's property without permission. When an individual camps on private property with the owner's consent, they have the legal right to be there, thus negating the elements required for trespassing.

In contrast, staying after being asked to leave, entering a building without permission, and ignoring “No Trespassing” signs all represent scenarios where consent has been revoked or never existed, clearly constituting trespassing. Therefore, the presence of consent in the action of camping makes it the only option that does not warrant a trespassing charge.