41 CFR § 301-74.14
What records must we maintain to document the selection of a conference site?
June 9, 2020
For each conference you sponsor or fund, in whole or in part for 30 or more attendees, you must maintain a record of the cost of each alternative conference site considered. You must consider at least three sites. You must make these records available for inspection by your Office of the Inspector General or other interested parties.
[FTR Amdt. 89, 65 FR 1327, Jan. 10, 2000. Redesignated by FTR Amdt. 2013-01, 78 FR 65212, Oct. 31, 2013]