A little over 3 days from now (evening of Aug 12 for those in the americas): https://www.timeanddate.com/countdown/generic?iso=20220812T18&p0=55&ud=1
Remember to get your fireworks ready, if you have spare base materials from previous years. And plenty of fire and etheric techniques and power buffs if you want to tangle with the Intertwined Serpents. If you're in a position to pick up Pyrophobia, that's a good one. Getting some smoky techniques prepped in advance could also be useful, for the Smoke Dragon.
Edit: And the Pre-Metroplex Day Excitement encounter is showing up, as expected.
Metroplex Day checklist! (Copy and post this for ease of use.)
[x] Launched: legal firework
[x] Launched: enhanced firework
[x] Launched: gold firework
[x] Launched: twin firework
[x] Launched: dangerous firework
[x] Launched: roman candle
[x] Launched: smoky firework
[x] Launched: scattering firework
[x] Launched: designed firework
[x] Launched: Midgard firework
[x] Launched: cancelled firework
[x] Fight (don't need to win): Fireworks Serpent
[x] Fight (don't need to win): Intertwined Serpents
[x] Fight (don't need to win): Firework Spider
[x] Encounter some number on non-combat fireworks encounters?
[ ] Grand Finale (check all above?)
[x] rode the Metros for free
[x] fish up waterlogged plush
[x] return the waterlogged plush
[ ] Trade Fireworks on the quad:
[x] Legal firework (no trade)
[x] Enhanced firework
[ ] Twin fireworks
[ ] Gold fireworks
[ ] Dangerous firework
[ ] Twisted firework
[ ] Smoky firework
[ ] Scattering firework
[ ] buy legal fireworks for next year
[ ] Launched: legal firework
[ ] Launched: enhanced firework
[ ] Launched: gold firework
[ ] Launched: twin firework
[ ] Launched: dangerous firework
[ ] Launched: roman candle
[ ] Launched: smoky firework
[ ] Launched: scattering firework
[ ] Launched: designed firework
[ ] Launched: Midgard firework
[ ] Launched: cancelled firework
[ ] Fight (don't need to win): Fireworks Serpent
[ ] Fight (don't need to win): Intertwined Serpents
[ ] Fight (don't need to win): Firework Spider
[ ] Encounter some number on non-combat fireworks encounters?
[ ] Grand Finale (check all above?)
[ ] rode the Metros for free
[ ] fish up waterlogged plush
[ ] return the waterlogged plush
[ ] Trade Fireworks on the quad:
[ ] Enhanced firework
[ ] Enhanced firework
[ ] Twin fireworks
[ ] Gold fireworks
[ ] Dangerous firework
[ ] Twisted firework
[ ] Smoky firework
[ ] Scattering firework
[x] buy legal fireworks for next year
I'm not seeing anything that jumps out at me as new chemistry or electronics components, but it looks like there may be something new this year. I've set off all the known fireworks, seen the noncombat encounters, done the trading, beaten the Intertwined Serpents, Smoke Dragon, Firework Spider and some Fireworks Serpents, but the finale is still not showing for me. Doesn't seem to be anything new for sale alongside the cancelled circuit, or in any of the other Zaibatsu shops or the bookstore.
Edit: I saw the update from GoldS about the new result for using 2 twisted fireworks while not etheric. After getting that, my next noncombat was the finale.
This year's rewards (looks like the annual firework is bugged):
You find a street vendor picking up his blanket and wares. "Hey, saw you enjoying the fireworks on Metroplex Day. Good show, eh?"
"Here, I've got some extra merchandise from then. Can't move it any other day, so you can have it."
He slips you a handful of merchandise and heads on his way.
You found: dragon twin statuette
You found: sparkling glass claws
You found: firework globe
You found:
You found: Metroplex Day book
You found: eternal sparkler
You found: fireworks shades
You found: 22 charred fireworks
It looks like the game was trying to award item #2996, which doesn't exist yet. It isn't actually added to your inventory either - trying to equip 2996 or use 2996 in crafting gives the "you don't have that item" message.
This should probably be fixed now, and Kinak put the waterlogged firework into my inventory.