Holidays are special days that makes different things to happen, such as the land, the weather and the items that are might added while the holidays.
Hearth's Warming Eve
|Twilight Sparkle||Clover the Clever|
|Rainbow Dash||Commander Hurricane|
|Pinkie Pie||Chancellor Puddinghead|
Hearts and Hooves Day
Hearts and Hooves Day, a.k.a. Valentine's Day, is a holiday that lasts about 2-3 days. The Mane 6 won't wear costumes, and the weather is just normal. Lovestruck is the quest giver for Hearts and Hooves Day, and also added in the 2013 Hearts and Hooves Day update.
Saint Patrick's Day
Easter is a holiday that lasts about 2-3 days. The Mane 6 won't wear costumes. Forsythia as well as some decorations were added in the Easter update.