2 C.F.R. § 200.432
A conference means an event whose primary purpose is to disseminate technical information beyond the recipient or subrecipient and is necessary and reasonable for successful performance under the Federal award. Allowable conference costs may include the rental of facilities, speakers' fees, attendance fees, costs of meals and refreshments, local transportation, and other items incidental to such conferences unless further restricted by the terms and conditions of the Federal award. The costs of identifying and providing locally available dependent-care resources for participants are allowable as needed. Conference hosts/sponsors must exercise discretion and judgment in ensuring that conference costs are appropriate, necessary, and managed to minimize costs to the Federal award. The Federal agency may authorize exceptions for programs including Indian Tribes, children, and the elderly. See also §§ 200.438 , 200.456 , and 200.475 .
2 C.F.R. §200.432