I just bought every issue for this event, what am I in for?
It just exists to give all the Earth 2 people a new planet to live on ever since their Earth was destroyed by Darksied. Saved you a bunch of reading for what was a very meh "event" that I didn't even finish. It's fucking awful and you should just download your books pleb.
The tie-ins are good at worst, but the main event sucks ass due to proximity of Earth-2 after Robinson left.
And all the spin offs from it are decent except for Telos, but it's been canceled.
Just read the Superman Convergence miniseries (the one with Pre-Flashpoint Superman and Lois), Shazam Convergence miniseries, the JSA/Action Comics/World's Finest/Infinity Inc miniseries and maybe the Crime Syndicate and Plastic Man ones and then pretend the rest of Convergence didn't happen (come to think of it, that's not hard to do considering the epilogue given in Infinity Inc doesn't match up with what happened in Convergence anyway).