You just need to have it in writing that you notified the FSDO...

61.113
(d) A private pilot may act as pilot in command of an aircraft used in
a^M
passenger-carrying airlift sponsored by a charitable organization
described^M
in paragraph (d)(7) of this section, and for which the passengers make
a^M
donation to the organization, when the following requirements are
met:^M
(1) The sponsor of the airlift notifies the FAA Flight Standards
District^M
Office with jurisdiction over the area concerned at least 7 days before
the^M
event and furnishes--^M
(i) A signed letter from the sponsor that shows the name of the
sponsor,^M
the purpose of the charitable event, the date and time of the event,
and the^M
location of the event; and^M
(ii) A photocopy of each pilot in command's pilot certificate,
medical^M
certificate, and logbook entries that show the pilot is current in
accordance^M
with Secs. 61.56 and 61.57 of this part and has logged at least 200
hours of^M
flight time.^M
(2) The flight is conducted from a public airport that is adequate for
the^M
aircraft to be used, or from another airport that has been approved by
the^M
FAA for the operation.^M
(3) No aerobatic or formation flights are conducted.^M
(4) Each aircraft used for the charitable event holds a standard^M
airworthiness certificate.^M
(5) Each aircraft used for the charitable event is airworthy and
complies^M
with the applicable requirements of subpart E of part 91 of this
chapter.^M
(6) Each flight for the charitable event is made during day VFR
conditions.^M
(7) The charitable organization is an organization identified as such
by^M
the U.S. Department of Treasury.^M