When a new Regular Bingo Chapter starts, you can continue and complete other previous Regular Bingo Chapters that you could not complete during the event period.
But when a Regular Bingo Chapter event is not ongoing, you cannot play previous Bingo Chapters.
You cannot play Special Bingo Chapters once the event period is over, even though Regular Bingo Chapter event is ongoing.
※ How to play previous Bingo Chapters:
1. Tap on the 'Bingo' icon.
2. Slide the screen to the right.
3. Tap on the previous Bingo Chapters that you weren't able to complete.
(At the bottom of the screen, you can check the current Bingo Chapter that you are on.)