Quickservice chains including McDonald's, Carl's Jr. and Dunkin' Donuts have been attracting guests with seasonal promotions that go beyond the major holidays, including fish specials for Lent, Shamrock Shakes for St. Patrick's Day and Father's Day doughnuts. Limited-time offers have increased 25% in the past five years at the 250 largest U.S. chains, according to Technomic.

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