so she goes to a wedding alone but if you guys weren't having marital problems, I'm assuming you would have gone with her.

But you're going out to a party tonight,
that I'm very sure she knew about as well even if she says she forgot about it or didn't remember the date, etc. (she knew about it obviously, she mentioned that she was invited as well)

Go to the party tonight, she needs to get used to the fact that this is what she wanted, she wanted to separate from you and live her single life, etc. And you be there to support her freedom, babysit whenever she needs you to and not have a life of your own in the entire process.

I never said she would be logical and I also mentioned that she would test you constantly with demands, expectations, bringing up the past, all the crap you've done, "tallying up the scorecard", etc.

Like I said before, expect this.

Since you're expecting it now,
you know that it's coming,
you know you don't have to get angry about it,
you just carry on as you would normally, with a smile on your face and proverbial spring in your step.

Get ready, look good, smell good, dress good, and have a great time tonight.

Tonight is your night to get out, enjoy yourself, have a good time, reconnect with friends/family, etc. And your wife can deal with the fact that this is part of the reality she has chosen, there will be nights when she goes out and you're at home watching the kids, there will be nights when you go out and she's watching the kids. She asked for a separate life, this is part of it.

However, no need to put any of this in her face.

Let her vent, get angry, etc.
You can't control her or her reactions, emotions.

You're doing good, keep it up.

And think about this,
just last weekend you were technically preparing to move out of your home away from your wife & kids because she wanted you out.

You turned things around,
you are in your home, where you need to be.
As for her, if she doesn't want any of this, there will come a point where she will consider moving out, if that's the case, no worries, help her pack her bags, this is what she wanted and you're giving it to her.

You just be happy you're still at home, with your kids, and responding to your wife in a mature way.