Disclaimer: There is no "official" schedule. Info in this page might be wrong if Neversoft randomly changes their minds.
The information is based on the Erolabs server.
Every 2 weeks, we get a new Event Story, with an Event Banner. This update has a maintenance that always happens on the same time of the day.
Every other 2 weeks, we get 3 new banners: Two RGB 5★ banners which are usually reruns, and a Light/Dark Mysterious Banner. On the same week, we get a Resupply Project event for the weekend.
The Event Story comes with its own featured unit, banner for the featured unit, event
EVERY 1ST DAY OF THE MONTH:
Free VIP Resource Supply Pack restocked for all users
Purchase limits for Purple Crystals and Eternal Emblem in guild shop restocked
EVERY MONDAY:
Weekly purchase limits on the shop (Normal, Pledge crystal, Medal of Honor, Guild member shop, etc) restocked
Arena rank reset, tier demotion and reward granted
Base > R&D Laboratory > Ampleon crafting limit restocked
Base > R&D Laboratory > Legendary Catalyst conversion limit restocked
A new event story is featured every 2 weeks. The update always includes a maintenance period which lasts from 06:00-09:00 (UTC+0).
The update also includes a rate-up banner for the event's featured unit (standard 120 pity), new Imaginary Chasm levels, and new packs that aren't worth buying.
A new Event Reward Shop accompanies every event, which lasts 3 weeks instead of 2, so that anyone who is late to turning in their event tokens can do so for 1 week after the event ends.
For more information about events, check (under construction).
On every other week where a new event isn't featured, two RGB 5 star banners (standard 120 pity) are featured after the Wednesday patch. This update has no maintenance and is applied immediately after daily reset.
The featured banners are almost always reruns of existing units, but sometimes new unit debuts happen this way as well.
The event reward shop for the previous event expires on this day as well, so be sure to use every last bit if you haven't already.
Every 21 days, a new light/dark (ML) rate-up banner is featured after the Wednesday patch. Mystery Recruit banners share the same pity count and the previous pity will carry over (200 to pity in total).
The featured unit always alternates between light units and dark units, and 2 new units are released followed by 2 reruns. This means that the mystery banner schedule is as follows: Light new unit, Dark new unit, Light rerun unit, Dark rerun unit, and repeat.
A new battle pass is featured every 28 days on the regular Wednesday patch for that week. Any progress on the previous one is lost and there's no way to go back to them to complete them retroactively.
Fortunately battle pass progression is simply tied to playing the game, so it's easy to max it out in a few weeks.
Normally you must pay gold to remove equipment from units, but this fee is removed during every weekend.
For this reason you should only swap equipment during weekends unless it's urgent.
This also makes weekends the perfect time to push Virtual Reality and Imaginary Chasm progress since you can quickly gear up a niche unit and un-gear them after you're done.
"Resupply prep" is not a real event. It is however 1 week away from the actual Resupply Project event.
On Resupply Prep day, which is every Friday on the week of a new event update, you should use up all saved-up energy in your mail inbox if there are any. After that, you should save energy in your inbox starting from Saturday to Friday next week (when Resupply Project starts).
Resupply Projects happen every two weeks, on the week where no new event is updated, from Friday to Sunday.
During resupply, drop rates from PvE is buffed:
Main Story CP points drop +50%
Element Exploration element drop +50%
Hunt Material drop +50%
No increase to Event Story drop
No increase to Gold (Astrocash), XP, or equipment drop amount
Resupply is the best time to farm Element Exploration if you've been running low on discipline elements. Otherwise, you should farm Hunts.
You should not farm Event Story during resupply.
Use up all of your saved energy in your inbox, use your energy batteries, and even buy energy with gems. Yes, it's worth it.
If you can't farm a Hunt level 11 yet, don't use your energy batteries or buy energy with gems. Farm Element Exploration. Work on getting a Hunt team up and running asap! Check the Guide Page for help.