After Poland's victory in the 2019 contest, the director-general of Polish broadcaster Telewizja Polska (TVP), Jacek Kurski, stated that the country would apply to host the event again in 2020.

[2] Previously, the venue had organised the national finals (in 2003–04 as Krajowe Eliminacje and from 2006 to 2008 as Piosenka dla Europy) for the adult and children's (until 2004) versions of the contest.

Germany would make their debut appearance, while Albania, Australia, Ireland, Italy, North Macedonia, Portugal and Wales would not return, having participated in 2019.

Prior to the event, a digital compilation album featuring all the songs from the 2020 contest was put together by the European Broadcasting Union and released by Universal Music Group on 13 November 2020.

[22][23] The Junior Eurovision Song Contest 2020 was, like the previous year, a joint project held by TVP and the EBU.

[24] Österdahl stated during the press conference before the contest final that this year's event "faced more challenges than perhaps ever before",[25] and that some worked double or triple the normal amount.

[13] The opening ceremonies, the draw and the interval acts were also broadcast live from Warsaw, with, according to the EBU, "all presenters and necessary crew socially distancing.

[33] The main trophy is a glass microphone with coloured lines inside the upper part, which symbolize the flow of sound.

She later returned during the interval to perform the 2019 adult Eurovision winning song "Arcade" with Roksana Węgiel and Duncan Laurence, the latter having his appearance inserted via chroma keying.

[38] Alicja Szemplińska then performed "Empires", the intended Polish entry for the cancelled Eurovision Song Contest 2020.

Closing the interval, all participants performed the common song, "Move the World", with their appearance also inserted via augmented reality and chroma key.

[39] Following the final, multiple delegations, including winner France, were accused of having used playback and pre-recorded vocals in the recordings of their performances.

"[40] Breaking a tradition introduced in recent years, in which spokespeople from each participating country were part of their respective delegations and giving the results at the contest's venue, for this year the spokespersons announced the jury 12 points from their respective countries and were connected to Warsaw via satellite, in the same way as the adult contest.

[52][53] For a country to be eligible for potential participation in the Junior Eurovision Song Contest, it needs to be an active member of the EBU.