Party of One, the twenty fifth episode of Season One was originally aired on April 29, 2011.

In this episode, Pinkie Pie investigates her friends’ excuses for not attending one of her parties.

It also features a song, Pinkie Pie's Singing Telegram, in which Pinkie Pie sings it to Twilight Sparkle, Rarity, Applejack, Rainbow Dash, and Fluttershy as a way of inviting them to her pet alligator Gummy's first birthday party.

Horse Play, the fifth episode of Season Eight was originally aired on April 28, 2018.

In this episode, Twilight Sparkle casts Princess Celestia in her stage play, only to discover that Celestia's talents lie elsewhere.

Cakes for the Memories, the second episode of Friendship is Forever mini-series was originally aired on April 27, 2020.

In this episode, Pinkie Pie reminisces about her past moments of laughter while making the cakes for Twilight Sparkle's princess coronation.

The Point of No Return, the fifth episode of Season Nine was originally aired on April 27, 2019.

In this episode, Twilight Sparkle realizes she never returned a book to the Canterlot Library and may have caused her favorite librarian Dusty Pages to lose her job.

Inspiration Manifestation, the twenty third episode of Season Four was originally aired on April 26, 2014.

In this episode, when Rarity loses her creative mojo, it's up to Spike to get it back.

Trivia

Tanks For The Memories, the fifth episode of Season Five was originally aired on April 25, 2015.

In this episode, to prevent her pet tortoise Tank from going into hibernation, Rainbow Dash tries to stop winter from coming to Ponyville.

It also features the song, I’ll Fly, which marks Rainbow Dash’s first solo in the series.

A Flurry of Emotions, the third episode of Season Seven was originally aired on April 22, 2017.

In this episode, Twilight Sparkle agrees to babysit her niece Flurry Heart despite already having a very busy schedule.

Owl's Well That Ends Well, the twenty fourth episode of Season One was originally aired on April 22, 2011.

In this episode, Twilight Sparkle befriends an owl who becomes her second personal assistant, to the displeasure of Spike.

Surf and/or Turf, the sixth episode of Season Eight was originally aired on April 21, 2018.

In this episode, the Cutie Mark Crusaders get sent by the Cutie Map to Mount Aris to help a young Hippogriff figure out where he belongs.

It also features the song, Your Heart Is In Two Places.