421.3. For the purposes of sections 421.1 and 421.2, where a fee paid or payable for a conference, convention, seminar or similar event entitles the participant to food, beverages or entertainment, other than incidental beverages and refreshments made available during the course of meetings or receptions at the event, and a reasonable part of the fee, determined on the basis of the cost of providing the food, beverages or entertainment, is not identified in the account for the fee as compensation for the food, beverages or entertainment, an amount of $50 or such other amount as may be prescribed is deemed to be the amount paid or payable in respect of food, beverages or entertainment for each day of the event on which food, beverages or entertainment is provided.
For the purposes of this Part, the fee for the event is deemed to be equal to the expenses incurred minus the amount deemed under the first paragraph to be the amount paid or payable for the food, beverages or entertainment.