High School Graduation Party Etiquette?

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$50 is nice if you can afford it--$25 would be okay, too. If it's likely to be a smaller celebration, try to be generous, but if there are hundreds of acquaintenances invited to the party, those smaller amounts add up.

If you don't want to give money or a gift card, you could try a gift of a book, which would have meaning to you or the young person in transition from one stage of life to another, with a personal inscription. Your gift would probably stand out from the crowd that way.