LittleBigPlanet unavailable content

The LittleBigPlanet series features tons of DLCs that are cross-compatible across all games, published on various Sony consoles (see below). Some of them however were only available during specific events/celebrations and are either not listed in the Playstation Store or not available to be downloaded.

https://community.eu.playstation.com/t5/LittleBigPlanet/LBP-DLC-Issues/m-p/22797242

Disney Content
On December 14, 2017 it was announced that all Disney DLC would be removed from the PlayStation Store on December 21st.

LittleBigPlanet Karting content
With the closure of LittleBigPlanet Karting's servers, the in-game store (based on the PS Store) is no longer accessible an many DLC went missing from the proper PS Store.