Last year, new era cap company (buffalo, ny celebrated its 90th anniversary in business as a privately held company that makes a variety of hats and one of two suppliers of official mlb (major league baseball caps. according to the new york times, the company invited '90 influential people to create one-of-a-kind caps to be auctioned off for charity.' as a student of marketing, you would categorize this promotional event as a form of _____________.