Foreword
The upcoming banner list is based on the TW server and it seems Global server will follow this schedule - at least for now. So please be aware this schedule isn't 100% certain and it can change.
Events usually last for 2 weeks - only collabs last longer. If there are a two units listed, the second one is obtainable for free from the event.
Asura's Path (14.06.2022 - 28.06.2022)
Mahou Shoujo Erica's Abandoned Campus Paranormal (28.06.2022 - 12.07.2022)
Atelier Ryza Collab: Ever Doodler & Cat Hideout part 1 (12.07.2022 - 02.08.2022)
Atelier Ryza Collab: Ever Doodler & Cat Hideout part 2 (19.07.2022 - 02.08.2022)
Team Carrot: A Rabbit's Diary + Main Story: Episode 8 - Burning Ashes (26.07.2022 - 9.08.2022)
Lost Daybreak (02.08.2022 - 16.08.2022)
Passionate Wilderness (16.08.2022 - 30.08.2022)
Run! Pavonis (23.08.2022 - 06.09.2022)
Chapter 9 (06.09.2022 - 13.09.2022)
Encounter At Anartopia (13.09.2022 - 20.09.2022)
Madoka Collab (20.09.2022 - 06.10.2022)
Kagura on the Otherside (04.10.2022 - 11.10.2022)
Charcoal Feather (11.10.2022 - 18.10.2022)
Heroes Counterattack (18.10.2022 - 01.11.2022)
Chapter 10 release (18.10.2022 - 01.11.2022)
Frame Arms Girl collab (01.11.2022 - 15.11.2022)
The Fall of Bifrost part 1
The Fall of Bifrost part 2
Be Born and Die Again
A Carnival of Midsummer Drama part 1
A Carnival of Midsummer Drama part 2
Trip with Veronica
Elite banners last for 9 days.
Elite Banner (14.06.2022 - 22.06.2022)
Elite Banner (22.06.2022 - 01.07.2022)
Elite Banner (01.07.2022 - 10.07.2022)
Elite Banner (10.07.2022 - 19.07.2022)
Elite Banner (19.07.2022 - 28.07.2022)
Elite Banner (28.07.2022 - 06.08.2022)
Elite Banner (06.08.2022 - 16.08.2022)
Elite Banner (16.08.2022 - 26.08.2022)
Elite Banner (26.08.2022 - 02.09.2022)
Elite Banner (02.09.2022 - 12.09.2022)
Elite Banner (12.09.2022 - 22.09.2022)
Elite Banner (22.09.2022 - 01.10.2022)
Elite Banner (01.10.2022 - 09.10.2022)
Elite Banner (09.10.2022 - 18.10.2022)
Elite Banner (18.10.2022 - 27.10.2022)
Elite Banner (27.10.2022 - 04.11.2022)
Video guide
Check this video to find information which of the banners is worth saving for.