First I am sorry that this is where you find yourself currently. One thing I have mentioned to you before. The M isn't over just because of D, that's just a piece of paper, you will still have the emotional D to deal with; and lots of opportunities to continue to change this around. Remember, she will be in your life forever.
With that said, I would be friendly, cordial, civil and happy. This does not define you, yes is tough, it hurts a lot, and it will continue to hurt. Regardless of where we are currently, remember that we will eventually get to a better place, so why try to prolong it. Put a smile on your face, say Hi, small happy talk, and then say, enjoy your evening.
In court, I would take an attitude of love, don't fight over the small stuff, don't allow your lawyers to feed you adversarial things, she is not your enemy, she is the mother of your children, and if at the minimum, that's reason enough to want her to be happy.
Much love brother, I am praying for you and your family.
M: 34 W: 33 S: 7 S: 14 months BD: 6/2015 Separation: 6/2015 Back and Forth between Home and Moms