Magia Report, the parody manga that stars a borderline psychotic alternation of the main character who serves as both the court jester and the gameplay guide of the game, which then has a part in the April Fool day is also done by Fate/Grand Order and its Learning with Manga.
Howa Howa Girl event has an event structure a lot like FGO Setsubun 2018 event, being a tower-climbing event severely hampered by fatigue system, complete with extra challenge floors beyond the advertised event stories.
Teasing Creator: For the first few months of the game Sayaka Miki was conspicuous through her absence. Her appearence in-game was limited to The Cameo in Mami Tomoe's sidestory. Players would post sad Sayaka images in response to the game's Twitter announcements. In what might overlap with Ascended Meme, an event released in November 2017 features a battle against Madoka, Homura, Mami, Kyoko...and an empty spot where Sayaka would be. Ironically, a battle in the 2018 April Fools' Day event had Sayaka present along with Madoka, Mami and Kyoko - but Homura's the one replaced with the empty spot, probanly because her non-glasses self isn't in the game yet.