They finally did it. Alison and Jack tied the knot. A little more rushed than I was expecting. But, then again; the last time there was a big formal wedding scheduled, between two of the main characters, a progressively worsening time loop threatened to erase all of Eureka from history! And, Nathan Stark (almost uncharacteristically) sacrificed himself to keep that from happening.
Which explains most of Alison's irritability in this episode. She was no doubt flashing back to that Pyrrhic victory. She conquered her fear just the same, though. And, for that, I love her even more than Jack does!