Magic Story - In This Very Arena
* On Ravnica, Jace is meeting with Ral Zarek at a Rakdos show.
* Ral still has "Project Lightning Bug" set up without Niv-Mizzet's knowledge, which allows him to keep track of all Planeswalkers on Ravnica. Through this, he was keeping track of Vraska, and noticed that she made an erratic planeswalk, which he believes to have been a planeswalk without a destination set.
* Jace finds this interesting, but then realizes this means Ral has been able to keep track of the destinations of his planeswalks, which he confirms. Note that the project works through rain and fog being used to keep track of someone's position and noting when they suddenly disappear without explanation, so this ability doesn't naturally follow that set-up. This isn't addressed in-universe, so my assumption is that the distortion caused by the planeswalk can be mapped to different destinations.
* Ral assures him that he'll keep his secrets, but points out that there are many who'd love to be Guildpact instead of him, so he should at least put some effort into that.
* They leave the show and Liliana shows up, telling Jace about Tezzeret. Ral is annoyed that he'll have to leave his post as Guildpact again.
* Back on Kaladesh, the heroes leave the prison. As they prepare to search for Pia, they notice banners advertising an arena battle between Pia and Tezzeret.
* It looks like guards are approaching them, but it's actually Jace, Liliana, and Gideon using an illusion.
*
Kambal is in Skysovereign. He receives a spy thopter, which stores information as a drum of images on plates. From this, he learns that the Gatewatch noticed the banners, so the trap is set. The narration gets really weird here for some reason.
* Pia is in the same arena from Chandra's origin story when she first planeswalked, which... doesn't seem right. Weren't they in some random village and not an arena? EDIT: Checked, Chandra was captured at the village and then brought back to an arena in the city, so no conflict here.
* Rashimi wins top prize at the Fair. As Pia is brought up to the arena, she notices Rashimi excitedly talking with other inventors, who don't notice as the guards gently separate them from their inventions.
* Pia is pushed into the arena and the quicksmith match against Tezzeret begins. Quicksmith matches involve quickly building machines out of given materials--basically, Sealed. As she looks through her materials, she sees that Tezzeret is already assembling something.
* Pia makes a small thopter, but Tezzeret has created a crawler larger than him--he isn't even pretending to not cheat.
* Tezzeret swats away the thopter and sends the crawler toward Pia. She sends a servo toward it, which the crawler just runs over, but there was a bomb hidden in it, blowing away the crawler's legs. She scavenges parts from the crawler, and sure enough, there were parts she didn't have access so, and even metals she couldn't recognize.
* Regardless, Tezzeret is creating larger machines faster than her (due to his metal-manipulating magic) and she's overwhelmed. Tezzeret is about to strike a fatal blow, but Chandra intervenes.
* Tezzeret summons guards, and Jace breaks the illusion he placed to hide the Gatewatch, and they join the fight. I think it would have made more sense for Jace to keep at least one person a secret, but whatever.
* The audience disperses, though several are shouting pro-renegade cheers.
* As they fight, Jace finds that something is blocking him from reading Tezzeret's mind.
* Skysovereign appears overhead as Tezzeret declares that the Inventors' Fair has ended. He uses a metal platform to rise up to the ship, which then leaves.
* Now we have Cathartic Reunion.
* Saheeli finally appears. She tells Chandra that all the winning inventions have disappeared.
So, we've gotten through all the Kaladesh story beats already. Hopefully we'll get more not-Gatewatch stuff. This story demonstrates that Kaladesh desperately needed at least one story from the perspective of a random renegade and perhaps one from a random consulate guy. We have zero insight as to how the crowd feels about all these events.