Some might already know this but on all my play throughs I have only came across this twice.
In chapter 3, you can leave Micah’s mission ‘An American Pastoral Scene’, that you acquire in chapter 2 to almost the mid point of chapter 3. That way you clear up all missions until there are no others available. The final mission before doing Micah’s will be ‘Sodom, back to Gomorrah.’
When back on camp, Dutch will announce about Arthur, Bill, Karen and Lenny’s success; which will then initiate a minor party, except without the cases of beer everywhere, but most will still be drinking.
There is a scene, like in chapter 2 where Dutch danced with Molly and Mary-Beth asked Arthur to dance, except this time Dutch will dance with Susan and it will be Karen that asks Arthur to dance.
Just thought I’d post on here in case anyone missed it, I’m sure many have seen it. I had to keep replaying chapter 3 saves to work out how it worked as I hadn’t came across it in ages and even started to doubt if even seen it, but this is how I achieved it.