@MarianT Thank you for your informative reply. It's really helpful to know that the aspiration distinguishes between thrown parties and social events.
So I'm assuming, then, that some party types won't count toward the aspiration.
I'd read somewhere that parties that aren't called "Party" don't count, like Weddings and Weenie Roasts.
Along that line of thought, I can understand why a Black and White Bash wouldn't count, but don't see why a Dinner Party isn't acknowledged.
I completed this aspiration earlier this year and don't recall the party counter being so particular, hehe.
Maybe it's only "base game parties," except the dinner party. Hmmmm.
Marian, it would be great if you could share your insights on this aspiration after you complete it. This is such a daunting aspiration!