What the Demon Slayer episode hiatus could mean for season 2's Entertainment District Arc release
Episode 4 will be delayed by a week.

On Tuesday, the official Demon Slayer Twitter account announced that episode 4 of the Mugen Train Arc will be delayed by a week because of a special election in Japan. Episode 4 has officially been pushed back from Oct. 31 to Nov. 7.
選挙特番「Live選挙サンデー」放送に伴い全国フジテレビ系列での10月31日(日)の『テレビアニメ「鬼滅の刃」無限列車編』は放送休止となります。
— 鬼滅の刃公式 (@kimetsu_off) October 19, 2021
第四話は11月7日(日)に放送いたします。
また第四話のそのほかの放送局・配信に関してはこちらをご確認下さい。https://t.co/oC9tsCC8Ka#鬼滅の刃
Based on the original show schedule, we were supposed to have a one-week hiatus between the Mugen Train Arc and the Entertainment District Arc -- the hiatus week was supposed to be the week starting Nov. 28. We haven't heard official word on this, but it could mean that the Entertainment District Arc would be pushed back a week -- beginning on Dec. 12 rather than Dec. 5 as originally planned -- if Ufotable wanted to still have a gap week between the two arcs. Stay tuned.