Wynonna
I like how I make this post and then disappear for most of the day. WOO, WORK!
OKAY, SO. She would be running around trying to engage with people as much as she could, making sure Michael and Raylan always have a beer in their hand if they wanted it for making sure everyone stays fed. Sometimes Wynonna can pull out the Good Hostess personality, as long as she's sober. The more she drank though the more she might've gotten easily distracted by everything.
Mostly she just wants to make sure everyone has a good time. Jukebox would be going, pool would be played, etc. Just a fun night out celebrating a dude she cares (deeply) about.
She also definitely would have smooshed some birthday cake into Doc's face though not a lot. Just enough. Easy clean up, right? Absolutely.