| 释义 | April 28
 April 28HolidaysAdministrative Professionals Week (Last full week of April)Arbor Day (Last Friday in April) Apr 28, 2017; Apr 28, 2023Celebrated in: Nebraska
 Butter and Egg Days (First weekend after last Wednesday in April) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 Cynonfardd Eisteddfod (Last Saturday in April) Apr 28, 2012; Apr 28, 2018
 Fast Day (Fourth Monday in April) Apr 28, 2014
 Feast of Ridvan (April 21-May 2)
 First Monday Trade Days (Thursday through Sunday before first Monday of each month) Apr 28, 2011; Apr 28, 2016; Apr 28, 2022
 Floralia (April 27-May 3)
 Freedom of Entry Ceremony
 Landing of d'Iberville (Last weekend in April) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 Landsgemeinde (Last Sunday of April) Apr 28, 2013; Apr 28, 2019
 Maryland Hunt Cup (Last Saturday in April) Apr 28, 2012; Apr 28, 2018
 Shad Festival (Last full weekend in April) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 Stockton Asparagus Festival (Last weekend in April) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 Take Our Daughters to Work Day (Fourth Thursday in April) Apr 28, 2011; Apr 28, 2016; Apr 28, 2022
 Tucson International Mariachi Conference (Last week in April)
 Vermont Maple Festival (Last weekend in April) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 Vidalia Onion Festival (Last weekend in April to early May) Apr 28, 2012; Apr 28, 2013; Apr 28, 2018; Apr 28, 2019
 World's Biggest Fish Fry (Last full week in April)
 Legal Holidays by Countries| National Heroes Day | Barbados |  | Orthodox Easter | Albania, Lebanon |  | Tensae | Eritrea |  | Victory Day | Afghanistan | 
 Legal Holidays in United States| Arbor Day | Nebraska |  | Confederate Memorial Day | Alabama, Mississippi | 
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