Report on the party... long story short, it was a blast!
I'd previously thrown a couple big parties like this during the semester, but this one I really had the most fun at. My bartender was pretty late to the show (1230am) so I took on the job, and this gave me plenty of opportunities to be social. Due to my "ladies drink free" policy, I had plenty of opportunities to talk to and flirt with any woman that came to the party, and my confidence soared.
One HB7 that I remembered was interested in me my last party, she came again and after a little flirting and kino she quickly became my shadow, touching me and following me as I went from room to room. It was hilarious watching other guys try to pick her up, and she even flirted back with them a little, but I knew I had her and played it ultra-cool. I ended up making out with her several times, but she ended up drinking a lot and her friend took her home. I figured at some point I could have dragged her into my bedroom, because near the end once we were alone in the spare room we basically attacked each other

She also insisted on writing her number on my forearm. I'm sure the HB7 will come to me and be an easy F-close with a little persistence. I was texting her a bit after she left, but wasn't able to get her to come back. I kept the frame of abundance/prized man, and TBH I'd rather escalate further when she wasn't drunk. If she had stayed, it would have been an easy f-close.
This other girl, an HB8 I had met a few times before through my parties, I really got to chatting up and flirting with as well. It was great, I'd be talking to the HB8 across the bar, turn around and make out with the HB7 for a few seconds, then turn around right back to the HB8. Made plans with the HB8 to jam together, and exchanged numbers. Not as much interest/kino as the HB7, but escalated to a kiss on the cheek. Not going to message either girl for a bit, since I'll be super busy this weekend with classwork, though I have a hunch the HB7 will contact me soon if not tomorrow anyway.
I felt on top of my game, and really became the life of the party. None of my ex's friends showed up, and if nothing else it definitely took my mind off her and I had fun with other women. I felt more comfortable gaming HB8 and lower since I wasn't in the "replace my ex" mindset, and rather just free to be myself and not fear rejection or anything else. That's what I meant by active gaming vs passive, I was passive here and will probably get an F-close and a good shot at the HB8 as well. Actually, the HB8 was also older (23) and a musician (big plus) so that could even be a good FWB or possibly more. Regardless, I had a lot more fun at this party than my earlier ones this semester.
Most importantly, I made a point to be social and friendly with everyone, including all the guys there too. Never brought up or discussed my ex with anyone. I was contemplating not even having the party due to my sour mood, but that quickly brightened up and I had the most fun at one of my parties I'd had all semester. Just knowing that I can't run back to my ex for sex gave me social energy, and it was great.
EDIT: Aside from the party, I've still been all mopey/stressed but I have made mental progress on the ex otherwise. All things considered, I am convinced my ex suffered emotional trauma as a child, and as such is extremely repressed emotionally. Emotional trauma also manifests itself in the body as physical ailments, and this is also very true of her. Whenever my ex is confronted with a difficult situation or conversation, she often ends up crying and isn't really able to express what she's thinking. It also explains her lack of empathy and why it's difficult for her to give anyone a genuine compliment, yet easy for her to criticize others and see nothing wrong with it. So while this belief has helped me tell myself that she's not girlfriend material, it still hasn't helped me not care about her. Yesterday I was beating myself up for not seeing this before and tempering my anger when she would upset me... long ago I even told her that I couldn't hate her because the things she did to piss me off were not intentional to hurt me, or anyone. She's not crazy like my ex before her, doing things like sending proof of an affair to a husband or burning pictures / possessions. This one has a very special brand of crazy; perhaps one day I'll be able to understand/handle it, but you guys were still right - not right now.