a) you're wrong: you are standing on public property and the school's public access means they are not private property.
Um not in the US. In California if you walked on to school property during school hours you must register with the front office. This applies to non students at the school. Failure to register is a misdemeanor. OH yeah you cant be on the side walk if they ask you to leave,
627.2. No outsider shall enter or remain on school grounds during
school hours without having registered with the principal or
designee, except to proceed expeditiously to the office of the
principal or designee for the purpose of registering. If signs
posted in accordance with Section 627.6 restrict the entrance or
route that outsiders may use to reach the office of the principal or
designee, an outsider shall comply with such signs.
627.3. In order to register, an outsider shall upon request furnish
the principal or designee with the following:
(1) His or her name, address, and occupation.
(2) His or her age, if less than 21.
(3) His or her purpose in entering school grounds.
(4) Proof of identity.
(5) Other information consistent with the purposes of this chapter
and with other provisions of law.
No person who furnishes the information and the proof of identity
required by this section shall be refused registration except as
provided by Section 627.4.
627.4. (a) The principal or his or her designee may refuse to
register an outsider if he or she has a reasonable basis for
concluding that the outsider's presence or acts would disrupt the
school, its students, its teachers, or its other employees; would
result in damage to property; or would result in the distribution or
use of unlawful or controlled substances.
(b) The principal, his or her designee, or school security officer
may revoke an outsider's registration if he or she has a reasonable
basis for concluding that the outsider's presence on school grounds
would interfere or is interfering with the peaceful conduct of the
activities of the school, or would disrupt or is disrupting the
school, its students, its teachers, or its other employees.
627.5. Any person who is denied registration or whose registration
is revoked may request a hearing before the principal or
superintendent on the propriety of the denial or revocation. The
request shall be in writing, shall state why the denial or revocation
was improper, shall give the address to which notice of hearing is
to be sent, and shall be delivered to either the principal or the
superintendent within five days after the denial or revocation. The
principal or superintendent shall promptly mail a written notice of
the date, time, and place of the hearing to the person who requested
the hearing. A hearing before the principal shall be held within
seven days after the principal receives the request. A hearing
before the superintendent shall be held within seven days after the
superintendent receives the request.
627.6. At each entrance to the school grounds of every public
school at which this chapter is in force, signs shall be posted
specifying the hours during which registration is required pursuant
to Section 627.2, stating where the office of the principal or
designee is located and what route to take to that office, and
setting forth the applicable requirements of Section 627.2 and the
penalties for violation of this chapter.
627.7. (a) It is a misdemeanor punishable by imprisonment in the
county jail not to exceed six months, or by a fine not to exceed
five hundred dollars ($500), or by both, for an outsider to fail or
refuse to leave the school grounds promptly after the principal,
designee, or school security officer has requested the outsider to
leave or to fail to remain off the school grounds for 7 days after
being requested to leave, if the outsider does any of the following:
a) Any person who comes into any school building or upon
any school ground, or street, sidewalk, or public way adjacent
thereto, without lawful business thereon, and whose presence or acts
interfere with the peaceful conduct of the activities of the school
or disrupt the school or its pupils or school activities, is guilty
of a misdemeanor if he or she does any of the following:
(1) Remains there after being asked to leave by the chief
administrative official of that school or his or her designated
representative, or by a person employed as a member of a security or
police department of a school district pursuant to Section 39670 of
the Education Code, or a city police officer, or sheriff or deputy
sheriff, or a Department of the California Highway Patrol peace