Leaving out the stuff on going since it's kind of mess
Events:
7/12~7/21 - Tempest Trials+
7/14~7/23 - Morgan & Morgan BHB
7/16~7/21 - Rokkr Sieges
7/22~8/6 - Aether Raids Event. Guessing some Three Houses themed buildings with special quests for them?
7/22~8/4 - Forging Bonds
7/24~8/2 - Klein & Clarine BHB revival
7/25~8/14 - New, non-encore Tap Battle. I'd be happier if the rewards were improeved...
7/26~7/31 - Grand Conquests
7/31~8/6 - Mythic Hero Battle
8/1~8/6 - Voting Gauntlet
8/2~8/11 - GHB (likely to go with the next banner)
8/7~ - Forging Bonds
Banners:
7/14~7/23 - BHB Banner (Morgan, Morgan and maybe....Grima?)
7/15~7/26 - New Power (Luke, Roderick, Matthew, Raigh)
7/22~8/6 - New Heroes (probably Three Houses #1, Byleth-M enters the pool here)
7/27 ~8/4 - Close Defense Banner (Only 4 candidates: Sigurd, Sumia, Velouria, B-Ephraim)
7/31~8/6 - Mythic Hero Banner
8/5 ~ - Savage Blow Banner (Camilla, Rhajat and Leo. There's literally only one other unit in the game with SB and that's Narcian...)
8/7~ - New Heroes (Three Houses #2, most likely)
The august New Heroes will probably forgo GHB for a tempest unit