Don't feel like you have to constantly bring the reader up to speed.
Now, this is a sin committed by superhero comics far and wide, so I want to make it clear that I'm not just laying this at Flashpoint's feet, but when you're reading an event book, particularly one that's supposed to change the very fabric of that particular superhero universe, you want to see the fabric-changing. You want the big stuff, the bombast, the epic, continuity-altering splash pages that you'll never forget. You want Superman carrying Supergirl's body or Batman shooting Darkseid. Now, there are epic moments like that in Flashpoint, to be sure, but they're nestled in between what feels like page after page of characters explaining things to each other, including things that we as readers have already learned. As Chris Sims of Comics Alliance pointed out back in 2011, the book features, among other things, an extended sequence of characters saying their names and telling each other things they all supposedly already know. In some instances, this particular story just requires some explanations between characters, since Barry doesn't yet know the status quo of this world, and the other heroes don't know Barry. I can forgive that, but the thing is it never quite seems to stop, even in the more action-heavy later issues. I know most events are designed for readers to go in blind for maximum sales, so explanations are necessary, but I don't want to crack open Convergence and find that it's a bunch of characters explaining over and over to each other what I already know from solicit copy and past issues. At a certain point, you just have to let the plot speak for itself.